I already have a MBP; I wanted to swap my Windows 7 gaming rig and just get an iMac for the wife and me. I'll probably do some casual gaming, mostly Blizzard games. Everything else is home use and school work. Especially for her. I actually wanted to stay around $1,800. Is i7 over i5 worth it? Or would you rather add 16GB of RAM instead of 8GB? It's tough.