I see you're very determined to do this so for a start, the 3-4 GTX 690s you want won't be in stock for awhile. You'll find Blackbeard's lost treasure before you get those 690s in stock. That'll cost you
$3000-$4000 depending on how many cards you buy and what brand. Some brands come with better cooling or factory overclocks.
Here's the latest i7
Newegg.com - Intel Core i7-3960X Extreme Edition Sandy Bridge-E 3.3GHz (3.9GHz Turbo) LGA 2011 130W Six-Core Desktop Processor BX80619i73960X
That'll cost you $1,030.
So we're looking at about $4000-$5000 for just the CPU and that ridiculous GTX 690 setup.
And we're only maybe 1/10th done with the build..
oh boy.
DAT WALLET.