I'd go with this PSU
off of TigerDirect. It has higher wattage, about 20 amps less and the same connections. Plus it's a single rail solution and has a lifetime warranty. Not to mention the goodies.
Then buy the Evga GTS 250 512MB
also off of TigerDirect to get free shipping on the order.
Further, with the money you have saved from the Ultra PSU, you can buy this
RAM which is quite a bit faster. And that's before timing the RAM down a bit more.