I have a 2007 mini that I have fitted in a G4 PowerMac case. I did it as a project a while back and haven't messed with it much since. Now that the Mini comes HDMI and Thunderbolt I am interested in upgrading the old Sawtooth one more time (I know that I shouldn't call it that anymore). I am most interested in this because of Thunderbolt allowing the possibility of a real GPU. Has anyone done this? I'm assuming I can use any GPU that OS X has drivers for. I've seen these enclosures but would like someone with first hand experience to share their experience.