I smell a troll or someone that has never heard of pc gaming before. If you really buy a $20,000 pc, it will be outdated within 3 months. There is no point to buy more than 2 GPUs in a generation or shell out on a workstation processor. Things get faster everyday, you want the newest stuff right? Look at a GTX 680, arguably the fastest single GPU to date, 2 of them running in SLI destroys any game, even in 2560 x 1600p. No need to buy a system with ssd's raided in 0, because thats probably the worst thing you could do. (reliability wise). IMO never spend more than $5000 on a gaming pc, since the new hardware will be around the corner, just upgrade it then.
cheers