Looking to buy a 20 inch ACD to use with my MBP. I have a late 2011 MBP so I assume everything should check out as far as using the two together. The two should work fine with a mini-display adapter, correct? I've been trying to stay pretty cheap. I found this ad on Craigslist: http://dallas.craigslist.org/ftw/sys/2933218427.html emailed the guy and he is sending me pictures after work. Seems a little to good to be to, but we will see. Anyway, Any tips or things to look out for when buying a used display? Anyone know of a good place to find 20 inch ACD these days? I've seen them on eBay used for $169 but it seems a like a bad idea buying offline. Just trying to make sure I don't get screwed as well as get a good deal, thanks!