Which Laptop Should I Get Or Keep?

Take Mac 2 and install Windows on it. It shouldn;t lag, but you will still need to install the drivers. To be honest though, your not really going to have much of a performance boost, especially if you aren't playing games. Graphics cards determine nearly all of your performance in games, and any dual core CPU over 2 Ghz will be plently for most games (excpet for maybe Crysis). The only real advantage there is having 4 GB RAm, but thats easy to upgrade. But just go with Mac 2, mainly because it is simplly the better of the 3.