Probably going to buy an iMac in the next few days. I know I want 27", but other than that, is there any reason not to just get the cheapest refurb available? I do want to limit the damage to my wallet. Right now, the cheapest 27" is a 2010 3.2Ghz i3 with 1TB hd and a 5670 card, for $1269. The cheapest 2011 refurb is $1439, which is $170 more, but with everything a bit faster. Thoughts, advice?