Looks good. If you want to save some money then there's some really simple solutions.
- Get the regular P6T, not the Deluxe, you'll still be able to overclock just as far.
- Don't get the Raptor drive. No doubt it faster than a regular 7200RPM drive but I don't think it will make a huge difference, not enough to justify the extra cost over a mainstream drive anyway.
- Pick a lower wattage PSU. A good 550W power supply is capable of running dual video cards, so there's isn't much point getting a 750W model. I'd suggest an Antec True Power New 550W or Corsair 550VX. Or better yet, if you can just keep your current Silverstone PSU.
I'd go for the GTX275 since it isn't that much more expensive than GTX260, and since you're getting such a good CPU you might as well team it with a more powerful card.
Intel Core i5 3570K - NZXT Havik 140 - ASUS P8Z77-V PRO - 16GB DDR3 2133 G.Skill Ares CL9 - Sapphire AMD 7970 3GB @ 1100/1500MHz - SanDisk Extreme 240GB - Samsung F1 750GB - Samsung F3 2TB - SilverStone FT02 - SilverStone Strider Plus 750W - Dell U2312HM - Windows 7 Professional 64-bit - CH Combatstick 568