I need help! Can't decide on which one. I own both machines. I just need to move one into my house for work use. Both have same specs save for the processors. I own and operate a marketing business. I currently use a 2008 8 core at home for work. Just want to upgrade it. Giving old one to my brother. Still works good. I have looked at the benchmarks. Both are still faster than any imac currently avail in raw power. Single core power is a advantage on the 3.33 6 core while the slight advantage goes to the 2.4 8 core for raw power. I will be using one of these to go over my engineers work and projects. So I need the some good power.