Forgot to put in that I have a ENGT220, but will most likely upgrade. It will be going to a 42'' HDTV with 1080p and 120 hz. How long ago did you build? Was thinking of maybe a good wireless keyboard from digitech. Just want something that will work with both Windows and Mac, the mac wired keyboard is also in the running now.
I have my pc for half a year, I have i750, gigabyte p55 mobo, 2x2gb a-data 10600 ram and also 500w fortron psu, so it is really very similar to your choices
but for 1080p you should get more powerful card than gt220, that's for sure,
I would recommend something more powerful than radeon 5750 even
just look on charts here on toms hardware (probably these 1920x1200 as it is closest to 1080p) and consider how much you are willing to spend for your gpu, you cant go wrong with either ATI or Nvidia at this time, there are no killer features currently that will really matter
but than you may consider a bit more powerful psu, but if you are not going for some dual-gpu or some power-hungry card, my opinion is that 500w will be enough - of course it has to be some reliable manufacturer, although I am from Europe, so we do not have every brand the same as in US
I read on this forum, that silverstone is okay. (we don't have that here, but reliable brands are seasonic, corsair and fortron, at least here, that's for sure)