Hello, is there anything I have to beware of or take care of, when buying a used MacMini from 2011 or 2012 (or maybe 2009)? Any recommendations? I need an Intel-Mac that is capable of running "Sonic Visualizer". I thought about older MacBooks or MacBookPros, but since I wanted to maybe use a bigger screen anyway... I thought a MacMini would be better. Also I like it, if I don't loose much room on the table. Are the 2012 MacMinis still user-upgradable re HDD and RAM? I also plan to sell it again in October, when I have time to make a longer (and thought through) buying decision, so maybe price dropping might be something to look for, too. Also it has to have Firewire. Thanks!