that depends...your biggest requirement would be a total of 26amps on the +12v rail for the 8800gts.
Also, id suggest getting the 16mb cache version of the HDD you picked if you can spend the extra money.
I don't think the sound card would be any better then onboard. So if you can't afford the 16mb cache HDD, then you can if you drop the soundcard.
edit: agreed with sora...the psu should be a good brand also for reliability. If the psu goes it could hurt part or all of the system which would be bad