I have an opportunity to pick up a late 2009 21.5" iMac at a great price, I'm also looking at a similar machine from mid 2010... Both iMac 21.5", both 500GB 7200rpm, both 4GB RAM, both wireless keyboard, both magic mouse. The difference is one is Intel Core 2 Duo 3.06GHz the other is Intel Core i3 3.06GHz. I was going to upgrade the purchased unit to 8GB RAM, but with the cost difference I could upgrade the C2D to 16GB RAM and still pay less than the i3. I've got an i5 MBP on order but have otherwise not worked with iX processors before, for general home use (iTunes, Mail, iPhoto, Safari), is the i3 that significantly better we are going to notice the difference??