I think that motherboard will do just fine. Just note, that you will have to reinstall a fresh copy Windows. Or just use your Dell's cd key.
2GB is all you need, unless you are into RAM hungry programs. Such as Adobe editiing software, or AutoCAD.
Coolmax is generally a no no, in Ste's power supply guide:
I would suggest the FSP (Fortron Source) power supply instead. They are highly reliable, for budget builds. Here is the link:
Newegg.com - FSP Group (Fortron Source) AX400-PN ATX12V 400W Power Supply 120/220 - 240v NEMKO, TUV, CSA, IEC, UL, CE - Retail