Hi WhitePhone5. With the first link you provided,
http://www.ebay.com/itm/APPLE-MAC-PR
item53f9688591 Clarify with the seller if the listing on the specs is correct. The Mac Pro was listed as Mid 2010, 3.2ghz. As far as I know, the Mid 2010 base model was 2.8ghz at 3g ram as default. Then the Mid 2012 Mac Pro base model was 3.2ghz with 6g default ram.
What I can suggest is if you can get a 2009 2.93ghz Quad Core llke this one listed as $1200 where the price is not too far from the link above
http://www.ebay.com/itm/APPLE-MAC-P...8598846?pt=Apple_Desktops&hash=item1e7860583e
Clarify with seller also on the cosmetic condition as some sellers only use stock photos and not the actual photo of the computer. There should be no major dents. Also on the first link, the Mac Pro has only 2G ram so factor in added expenses in getting more ram. Happy shopping.