I'm about to make the plunge into the world of Macs (totally excited) but I'm struggling with deciding whether to shell out $1,600 for a new 21.5 iMac (all costs in) or if I should save about $700 and buy a used 2009 iMac 20-inch, 2.66GHz Intel Core 2 Duo 2GB/320GB. Is it really worth spending that much extra $ to buy a brand new one? Any thoughts and/or advice would be much appreciated 