To say I'm not the most computer literate person, In respect to PC building, is a conservative understatement. I'm throwing one together on a website and I have a choice to make regarding the power supply. I'll post the components of the PC that I have so far, would anyone care to advise me on the proper amount of power needed?
Those guys didn't answer your question as presented. I will.
I would choose an Antec, as I have had experience with an Antec Tru-Power. As in it worked reliably and it was quiet in operation and trouble free. I have never heard of the other brand, a red flag. Antec is not my first choice, Enermax is, but you do not have that as a choice, you have Antec.
As your rig is configured, the cheapest Antec (Earthwatt) can run it well. The 9800GTX+ will be powered correctly by the 22A on the 12v rail of the EarthWatt 650W.
The NeoPower would be an as good choice, but they are modular in design, you store the extra cables you aren't using (for devices you don't have yet) and plug them into the PSU and the device when ready. I use a modular PSU and I simply store the stuff in the box it came in.
The NeoPower 650 is your best bang for the buck of the choices presented, is a reliable PSU, and well balanced for your CPU, MOBO and GPU choices and it is reasonably priced.