I just sold my 21.5-inch i3 because the warranty was expiring and I didn't want to purchase AppleCare. I am buying either the 27-inch 3.2GHz i3 (July 2010) or the 21.5-inch 2.5GHz i5 (May 2011). Regardless of which one, I am buying refurb from Apple.com. I don't need the processing power or the screen size more than the other. I am just trying to figure out which will be easier to sell in a year. It's between the 21 and 27, and the i3 and i5 processors. Trade-offs suck.