I've already considered E2xxx, but I thought that those are severely crippled by their small amount of cache. Surely overclocking would make up for that, but I wouldn't go too far, 2.4-2.6 GHZ maybe. Stock cooling and default voltage would be nice for long-term worry-free.
Does E2xxx beat Brisbane at the same frequency? I'd like to know because I believe I could safely up the X2 to those frequencies too.