The performance you get for the money is really worthwhile if thats your budget, overclocks well too, you should be able to run that at 2.1Ghz eazy-peazy, with stock cooling.
The above article is on the E2160s overclocking abilities. The same (even more so) applies for the E2140. They overclocked an E2160 to 3.2Ghz with stock cooling and perfect stability!
The E21** series' cache is reduced to 1mb (instead of 4) but in all other regards its a core 2 duo.
Cache affects gaming, and rendering and having a busy desktop with multiple programs open etc. bt not much else, ..and an E2160 OC'd to 3.4GHz bests a stock X6850 in most tests.
Ya , and it ain't exactly hard to do it either! Little extra voltage to the CPU, and fire away at the FSB, ..and RAM ratio too spose, ..bt that's really it, ..don't even need a fancy board!..