Engineering and fabrication - What are the best components for building a computer?

What are the best components for building a computer?

I am going to build myself a desktop computer and am looking at differeent components. What are the best ones out there in all the categories? Oh and I'm building a high-power gaming macine.

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Mobo: Rampage Extream II LGA socket 1366
Processor : Core i7 965
Ram: OCZ Triple Channel ram
Grpahics Card : Duel GTX 295's

This is how I would do it:
AMD Phenom II 940 3.0GHz Quad
Asus AM2+ motherboard with nForce 780a chipset
A set of nVidia GeForce GTX 285's in SLI
4x 2GB DDR2 1066 Corsair ramsticks
a pair of WD Veliciraptor 300GB hard drives in a RAID 0 for max performance, plus a pair of WD 640GB drives for storage (the 640 models are the fastest 7200rpm hard drives)
Thermaltake 800 watt power supply
a Blu-Ray BD-ROM drive with DVD-RW capability
another DVD-RW drive
24 inch wide LCD
a 17 inch LCD as a secondary (works very nicely for me)
Logitech G15 keyboard (i have the original version, it's the best)
put all the components in an ATX Full Tower case for best cooling, then get a good water cooling system, or even a refrigerated cooler
All that would cost a small fortune, but it will give you ungodly performance

Gaming eh.
I'm going to guess that you will be overclocking too, as most gamers do.
Alright... First off, for a gaming machine, you need to pick whether you want multiple GPUs or single GPU (video cards). If you want a very very fast machine, get multiple GPU's, but they may not always be stable. The solution for this is to get a dual GPU card like the nVidia 9800 GX2 or nVidia GTX295/285. The equivalent of this from ATI's side is probably the HD Radeon 4870x2 which costs around 600 dollars (not worth it). Alternatively, you can buy two separate single GPU cards and hook them up in CrossfireX or SLI. CrossFirex is ATI's solution to running multiple video cards, while SLI is the trademark for nVidia's solution.
From benchmarks that i've seen, it's clearly shown that though you have two videocards working on a game, the gain isnt twice as much. Also, SLI proves to be more successful than Crossfirex(therefore, go with nVidia if you want to get multiple GPUs).
What companies to buy from?
nVidia and ATI both fabricate their graphics card processors, but they dont physically put video cards together (actually, OEM cards are made by them. i would suggest staying away from them). They usually sell their core's to companies that add graphics memory and basically create the entire card. Great nVidia companies are EVGA and BFG. I would recommend EVGA because they support overclocking. You can literally solder different resistors onto their card, totally burn it up and they will still replace it for you lol (you gotta remove your solders before you return it).
Graphics cards i recommend:
Multiple GPUS:
nVidia GTX285 or GTX295 or 9800 GX2
Single GPUS:
ATI Radeon 4870
nVidia GTX280 or GTX260 or 9800 GTX+
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Power supply:
Generally with an overclocked gaming computer, you want no less than 500 watts. If you're using multiple graphics cards, you're going to have to go alot higher. Each graphics card can take up to 200 watts on it's own when under heavy load. I would say minimum 500 watts. Personally, i have a 750 watt power supply.
Good Companies:
Corsair
OCZ
Antec
TruePower
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Motherboard + CPU.
With a gaming computer you want one or two FAST cores. Quad cores dont do anything for games really. 99% of games utilize only 1 or 2 cores at max. having 4 cores simply gives you a slower clock speed and more heat. If you're low on budget, go with an AMD dual core, but if you got money, go for Intel. Intel's overclock alot better.. up to 40% on air, while AMD's only overclock at around 20% on air cooling.
For motherboards. If you want crossfirex, go with any motherboard that has two PCI-e x16 2.0 slots. IF you want SLI, however, you're outta luck. Only nVidia chipset boards have SLI. Look for something like the 750I/A (i means intel, a means amd) or the 780I/A or the 790I/A. Your motherboard really depends on your CPU. An alternative solution to multiple GPUS are the new x58 boards designed for Intel Core i7's. These can run both SLI and Crossfirex.
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Harddrive.
This really doesnt matter. You need to get a minimum of 7200RPM to meet today's standards. There's also higher speed harddrive disks or even Solid State disks which run even faster than conventional harddrives. Hard Drives depend on you.
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RAM
This depends on your motherboard. Most motherboards now adays take DDR2 Ram, but some of the newer and more expensive motherboards such as those with nVidia 790i/a chipset or the x58 motherboards, require a whole different catagory. There is DDR2 and DDR3 ram. DDR3 runs ALOT faster (super fast access times) but its also ALOT more expensive. DDR2 is the standard today and it works for most games/applications you find. Stay away from Kingston Valuram. Crap ram right there. Go with higher speeds. I would suggets minimum 800 mhz, but if you want to really go higher, you can get 1066 mhz DDR2 ram. DDR3 ram, can go up to 2000 mhz when overclocked.
I hope i've helped. Choosing a computer case fully depends on your style and what you want on the outside. Just make sure it pushes air fast enough to cool down your internals :)

Depends on what you can afford, prices vary a lot. A motherboard with 1333FSB and 2 pci expressx16 slots for 2 video cards. A quad core processor of at least 2.5Ghz. 4 gigs ddr2 ram 1333Mhz. 320gig hard drive with 16MB cache.64 bit operating system like vista64. Checkout Cyberpower,Inc. They have good prices and do a great job.

hi,
It depend on your requirement for which purposes you need it,
For Gaming or a office work or a 3D animation Graphic work
A office use system specification is as blow
Core Duo Processor 2.0Hz
Ram 1GB
Super Drive
128 VGA Card
LTO3
LTO 3
Regard:
Jerry Paul