So I've been wanting to buy the new iMac for near $1,100 after tax refurbished from apple, but I have a chance to buy the really old aluminum 2.0 GHz for $450. It's mint with the box and has all the accessories, as well as iWork 08 and Bose Speakers. 250 GB HD and 3 GB Ram, as well as a dual core processor. My question is, should I buy this knowing the value will only decrease for $450 or wait out for the new model? Also, I'm a noob so what's the difference between core 2 duo and dual core? I don't want a core duo desktop, but I'm not sure what "dual core" means or if it's different from core 2. Thanks guys.