Plans on OC'ing? Gaming? Work? need a little more info.
I would recommend another hard drive for space because 150 gig will get filled up fast with random crap.
People are going to recommend you get a better Power supply - antec is my personal favorite, but to each his own. I would say that you can probably save some money on ram and just go with 4 gig, but I don't know exactly what you are building for.
are you planning on SLI in the future? If so, that PSU will need to be bigger.