Do you just want the iMac for looks? The MBP you listed should be good for running app that you would run on the iMac. I would keep what you already have. You're not really going to get a Mac that is as gaming capable as your current gaming PC. All the Macs except for the Mac Pro are essentially laptops in different form factors. If games are really important, maybe a Hackintosh would suit you better. But you cannot match the aesthetics of the 27" iMac, so if thats what you want you will just have to bootcamp it and deal with the performance. You might even simply get used to it, like PC gamers that went to console.