Well probably the "best" gaming now is
2x Intel Xeon 5680 (3.3Ghz)
Evga SR-2
48Gb Corsair DDR3-2133Mhz
4x Evga GTX580 SSC-FTW
Creative X-Fi Titanium HD
2x Intel 510 SSD w/ Adaptec RAID 5805Z ( for boot drive )
2x Intel 510 SSD w/ Adaptec RAID 5805Z ( for games drive )
2x Samsung F3 3Tb Raid 0 ( for storage )
3x Dell 3007WFP 30" IPS LCD monitor or 3x Dell U2711 27" IPS LCD monitor
2x Corsair AX1200 PSU
Topre Realforce 86U Mechanical Keyboard ( best for gaming and typing ) or Razer BlackWidow Ultimate ( for typing only )
Razer Mamba or Logitech G700
I'll get back to you with the casing and speakers if I have more time.