I think either way his PSU will handle it, since he has a GTS250 right now.
If you want a Nvidia card that will stand alone in its class in terms of bang for the buck performance at $200, look no further than a GTX560. don't get the 550, it actually quite honestly, really sucks.
i cant remember the brand of my PSU off the top of my head but its set up to handle SLI for gaming and its a 7 or 8 hundred watt. i know it can handle preddy much anything on the market at the present point of time.
So i picked up a EVGA superclocked geforce 560.... mmmm mmm mmm. battle field 3 with maxed out graphics and direct x 11. the characters now have facial expressions when they talk. and my PSU has no problem running it. thanks for the suggestions guys