I've currently got a base spec Mini, with a SSD i put in myself. Its an alright machine, it works pretty good, its quiet and doesn't get in the way. Its pretty painful doing any Handbreak encoding, or audio bouncing on it though. I've been looking at a 1,1 Mac Pro on Ebay, they are pretty cheap at £300. I could up the proc's to Xeon 5355 quads for around £45. And ram is cheap. Side grade or Up Grade? It would be nice to be able to use PCI audio stuff too. Also, whats the deal with using USB on these things? Just chuck a USB 3 card in?