Was going to make a move to the x1950xt for $250, but the 8800gts is now $399 and cheaper. Problem is my 2 year old Thermaltake 480w is only rated for 18A off the one and only 12v rail. I've seen the highly rated power supplies starting at $130 and up. Is it necessary to go there, or is there a steal out there to be had? Thx.