I'm looking to upgrade my iMac to a Mac Pro. And, I think the Quad-core would suit me just fine, in all honesty. But, I have this terrible feeling that if I were to get the 4-core model, I'd always feel like I should have splurged for the 8-core, even if I don't necessarily need it. Does anyone here have a 4-core, and regret not going for the dual processor option? Or, on the flip side, are there any 8-core owners that feel like they would have been perfectly happy with a 4-core? I fear a Macbook Pro like situation coming about. I don't want to get a 4-core, and then in 6 months, Apple drop the 4-core all together and lower the price of the 8-core. I know no one can predict the future... I'm just looking for a little advice/guidance.