Hi guys. I've decided I need a new Mac. I've upgraded this old 1.1 as much as it will go and it's still not able to handle even the simplest of graphical games. Upgrading the memory was pointless as it bearly touches it, and I rarely use more than 15% processing power. And yet I get crash after crash after crash. I've figured out it's the actual 2006 architecture, so time to not just upgrade, but up size. So what Mac is a good one? I'd like one that I can upgrade as needed. It must run El Capitan, be able to handle gaming, and be under $1000 AUS ($500 US). I'm confused by the Mac Air, iMac, Mac book, Mini Mac....... Which is best?