everybody else seems to be jumping on the inkjet bandwagon, and now i'm finally looking at getting an Edge. so, is a NEW edge any better than a used one? does it do more, or am i just buying piece of mind (assuming they keep making replacement parts). if i get a used one and it needs a new head, what's that gonna cost me? i saw an ad for one "that just needs a power supply" so it seemed like it might be worth maybe $500 as a gamble.