I have a 27" iMac, and have been wanting a current Mac Pro before the new ones roll in. On craigslist someone was selling their Mac Pro 2012, the 2.8GHz Quad Core. It has 2x1TB HDD's, 6GB RAM, 240GB OCZ SSD. I have the 27" iMac with SSD and 1TB, 8GB RAM. Theirs has Apple care and mine does not. They say they would love to trade. WHat should I check out on the Mac Pro?