Ok, I'm just going to quote CPC magazine for the "best hardware money can buy".
CPU: Core i7-2600K (better than an i7-980X at a third of the price)
Motherboard: Asus Maximus IV Extreme (the Z version hasn't been reviewed yet).
RAM: Corsair Dominator GT CMGTX7
SSD: OCZ Vertex 3 (significantly faster than the Crucial M4 series)
Graphics: AMD Radeon HD 6970 2GB (yes, they did test twin GTX 580, and even twin GTX 590, and twin HD6990 too, but after all that testing they decided the severe microstuttering and slower performance in games makes CrossFireX and SLI a stupid choice).
Case: Silverstone Fortress FT02B-W V1.7 (one of the cases that rotates the motherboard by 90-degrees) for air, Silverstone TJ07 for water-cooled.
CPU Cooler: Be Quiet! Dark Rock Pro (for air - it's more difficult to create a comprehensive recommendation for water-cooled systems)
PSU: Corsair HX850.
Sound Card: Creative X-Fi Titanium Fatal1ty Pro
Monitor: Viewsonic VP2365WB.
FYI, whilst multi-GPU setups provide good performance in EyeFinite setups, the microstuttering is not worth it. Also, a single single-GPU flagship graphics card can work pretty well in EyeFinite. IMO, playing games in ludicrously high resolutions is stupid. I normally use a simple 22" LCD-TV + an old 17" monitor, but I have used my computer on my 42" TV and I just didn't like it.