Hi guys, I'm thinking about buying a used mac mini (early 2009) with 2.0ghz and a 320gb hdd. it comes with no warranty, since the buyer claims he doesn't have the receipt anymore and never registered with apple. selling price is around $570 with magic mouse/wireless keyboard/office 2008 and snow leopard. the stuff is supposed to be in a very good condition and comes with all original packaging. is this a good deal or should i be worried because of no warranty ? i'd also go around to take a look at the actual hardware before buying of course to make sure it's working.