Personally i would give this build a complete overhaul:
CPU - The i5-2500k beats the i7-990x in games for a fraction of the price, that seems like the obvious choice. If you need hyperthreading get the i7-2600k.
RAM - That stuff looks expensive and the fan is pretty overkill, seems like unnecessary noise and cost to me. I would go for dual channel Corsair Vengeance 1600Mhz, 8GB would probably be best.
MOBO - Obviously with a 1155 chip you need a 1155 board. Getting a dual SLI x8/x8 capable board is going to be a lot cheaper and should give ample performance. The ASRock Z68 Extreme is a good board.
GPU - GTX 580 is a bit pricey but your budget seems high so that one is up to you, if it was me i would probably get a couple of GTX 570's or HD 6970's
HDD - The Velociraptor seems incredibly expensive for a drive that is going to be idle most of the time, a couple of Spinpoint F3's in RAID 0 would give a lot more space with good performance and be much cheaper.
Monitor - I would never buy a monitor with speakers, especially for a system like this. Even a $30 pair of PC speakers will sound a lot better.
jmsellars1 correct... 990x is no better than i5 2500k for gaming... i think you don't need a 1.5k watts to power two gfx cards... even in a heavily overclocked state... for such a high price build... to include only a 120gb ssd seems like not a good idea... for graphics card... even for a custom design card... i would only choose a card that will only takes up two slot... not 2.5 or 3... such as msi twin frozr iii series... here is list of recommendation.... i hope it helps