You know what, I'll build you an awesome computer for $1500 and you can give me the other $1500
Really you do not need $3000 for a good computer, after about $2000 you are just throwing things in there for the sake of having it. The more money you spend doesn't mean it will futureproof it, in a few years time something you spend $3000 might be worth only $1000 and in another year $500.
Technology evolves at such a rapid rate that it's best not to buy a really expensive computer, but to buy a good computer that will still play games on full settings and get great frame rates, and have the best price/performance so that when new technology and parts come out you can just upgrade with the money you didn't waste on buying 2x cards for Crossfire/sli or a $1500 CPU.
If you dead set on buying a really expensive computer, at least wait for the New Core i7's which even though have low Cache, i have heard are built like the old AMD's with a low L2 Cache and a high L3. They should be great.