I was in the same situation as you, had a E2200 and wasn't sure whether it would last me until the new Intel stuff arrives at the end of the year. Sure enough, after using the E2200 for a week at 2.9GHz I got fed up of the lowish FPS in CSS and brought a E8400 instead. It handles everything I throw at it and more! It's currently running at 4GHz and has been since I got it, I also have 5300 memory aswell.
Personaly if I was you I'd get the Q6600 now rather than hope the E2180 lasts you cause I don't believe it would.
Personaly if I was you I'd get the Q6600 now rather than hope the E2180 lasts you cause I don't believe it would.