Considering Huxley is based off the Unreal 3 Engine, I would recommend buying a quad core since Unreal Tournament 3 benchmarks have showed it is CPU demanding.
Now, here's what I think :
- If you buy the dual core 3.0GHZ (E8400) and overclock it to... let's say 4.0GHZ, than I would say you're better off with the dual core.
- Although since you're not into overclocking, I believe the 2.4GHZ (which can also be overclocked) quad core is the safer bet.
Remember you'll probably have this computer for the next 2-5 upcoming years.