I recently installed an Intel E2180 in a friends computer, and I have to say - that thing is fast. The default clock is 2.0ghz, but it was easily pushed to 3.2 with a custom cooler (Freezer 7).
The E2180 plays Crysis with absolutely no problem whatsoever. It easily pushes 30fps and more so overclocked. Actually, Crysis ran at almost 30fps with no overclock whatsoever.
The main reason I recommend the E2180 is because it's only 60 dollars and easily competes with two-hundred dollar processors up the line.
The only con with the E2180 is that it has a fairly small cache at 1mb. It does not seem to affect gaming and other uses, however, so this is hardly a con at the moment. This may become a problem in the future, however. Fortunately, replacing the E2180 down the road is not a big deal because of the small footprint it leaves in your wallet.