i agree with jack on this of your using the pc only for lfs, a bit pointless imho but hey, then the e8400 will be great but for me i do multiple things on my pc, some video making, pic editing, transcoding movies to dvd format, and alot of stuff were spreading the load works really well,so like jack i have a q6600, i depends on what you want to do, multi tasking, 4 cores are good but if you are only playing lfs a high power dual core is better
edit:and another thing to really remember especcially with all pc stuff is that just because its the most expencive dont mean its the best or the best for your needs