I'm aware, I usually use my computer for other things than gaming (programming/software development, cryptography related work, GIMP [yes, I run GNU/Linux] and all the trivial associated desktop rot like Firefox and friends), so this is a difficult choice -- I'm likely not going to do much gaming after this summer is over for a long time (probably some around Christmas-time) -- as such, ad interim I'd like to be enjoy a quad core system.
Also, you should be aware that while CryEngine 2 does not scale > 2 CPUs, e.g. UnrealEngine 3.0 does scale to at least 4 and does benefit from it, check out some benchmarks on e.g. Mirror's Edge.