Hi,
There is NO WAY you need a 750watt PSU -- save your money and buy a 300-500watt unit. I am a moderator over at
Silent PC Review, and they have recently reviewed a couple that fit the bill:
Nexus Value 430, and the
Nexus 5000; and
SeaSonic and some
Fortron Source units are high efficiency, quiet, and plenty powerful enough.
A
Scythe Mugen 2 is an excellent CPU heatsink, that comes with a bolt-through mounting kit, and it fits most sockets -- and it costs about $35 at NewEgg.com.
I'd get 2X 2GB sticks of RAM, and I'd get an Antec Solo case. The cooling air flow is very good, and the hard drive options are also unique.