So I am buying a new iMac in the next couple weeks. I want something that will last a long time. I don't really need a 24" monitor, but the 2.8GHz is only avail. on the big model. My question is, basically it will cost me $600 more to get my hands on a 2.8 Extreme vs. 2.4 Duo. Is it really worth it, or for your average user who isn't crunching huge PS renders every day, is it nominal. As I said, the only reason I would consider blowing the $$ is that the 2.8 is essentially part of the new line of processors that most of the future revisions will carry from my understanding, and I want to stay up to date as long as possible.(I am currently running 10.4 on a 700/512mb G3 iMac if that gives you any idea of how far I stretch my computers) Opinions anyone?