If you are only planning on using a single 8800GTX then a good PSU with about 34 amps on the 12v rails should be good enough as mpilchfamily
I recommend the Seasonic S12 500
. This is the PSU I personally use. It is very stable and very quiet too. This particlular unit has 33 amps on the 12v rail, but that is more than enough to power your system.
If you are looking for higher wattages then you look at other Seasonic PSUs. But there are other PSUs you should consider as well. apt403
provided a link to the PC Power & Cooling Silencer 610 PSU
, not sure how quiet it compared to the Seasonic S12 series though. Corsair has a line of PSUs you may want to consider such as the CORSAIR CMPSU-620HX
which is also made by Seasonic and are very quiet too. You can also opt for the OCZ GameXStream OCZ600GXSSLI
PSU as well.