The CPU is great! Don't let anyone talk you away from the E2180. It's going to easily outperform PS3 / 360 visuals on the same multiplat games.
Combined with the P45 mobo, you can overclock that CPU by 50%. That's the exact combo I have, and I've got the E2180 running at 3GHZ.
If you're on a budget you have to overclock, no question. Here's a good guide,
http://techreport.com/articles.x/13815
You might want to upgrade it a few years down the road when games support Quad Core, but by then, Quad Core will be $60 cheap :)
Chech the link in my sig for the build I used.