This is my first Mac. This is my first desktop since 1998. This is my first computer period since 2006. Ever since I got my iPad on release day last year I stopped using my PC. That all being said, I realize now that things are missing. Stuff i used to have run through my PC (media), doing all my backups and updates on my work computer, and now my photography is getting disorganized (i keep it on an external drive at the office). Its time to get a computer for real. But I can't decide whether or not I need, or should get, anything more than the base 21.5. I will need photoshop and lightroom, but other than playing a few games, i can't think of anything that is resource intensive (ok, ripping and encoding videos would be). It just seems like most people here get the 27 or the i7 and all of the upgrades, and I'm wondering, what am i really missing with the smaller one?