I'm not a total stranger to buying refurbished stuff. I bought a pair of refurb Sennheiser HD590 headphones in 2001, and they're still going strong today. I bought a refurb Mac Mini in 2006 (It must have been a 2004 model), and it's STILL working, albeit slowly. Ironically, the 2009 Mini I bought (brand-new) as its replacement just died on me, so I plugged the old one back in to replace IT! But I can't really run my business from a Chromebook, as much as I like my Samsung. I know I need a local-storage computer, and I know Macs tend to last a long time (and I'm a Mac guy, so there). I'm also dirt poor, and will be for some time to come. With that in mind, I'm checking out places like Mac of All Trades, etc. for yet another refurb -- as long as it's an Intel unit that can run Snow Leopard without choking to death, I'd be satisfied. Question is, how far back in time can I reasonably risk going? How long can a Mac reasonably be expected to function, assuming that it's been properly refurbished? If I drop $300-400 on a refurb Mac Pro from 2006 - 2007, for instance, can I expect to get, say 3 more years out of it? It's kind of a dumb and unanswerable question, I know. But if any of you veteran used-Mac buyers have some personal experiences to relate, I'd be grateful.