Need to buy parts for computer.Budget is 400$.Parts I need in details.Can you please recommend me some?

I need:
A new CPU(preferably 3.0. GHz and more)
Cooler
Graphics Card
RAM(working memory)preferably 2 GB and greater.

It needs to be more game efficient.I have a lot of games and my current computer parts can't handle it.Budget cannot exceed 400$

Can you recommend me some good parts?
Update: motherboard
AMD Sepron LE-1150
Update 2: AMD Sempron LE-1150
sorry for the mistake
4 answers 4