World's slowest cyclist.
Join Date: Oct 2007
Location: Londonderry, NH
Bikes: Cannondale CAAD5 and Cannondale Rush
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Generally speaking leftover models tend to be a better buy, for example the 2008 Pro Disk is listed on the link you posted as $1100. I'd assume a 2007 Pro is probably very similar to a 2008 Pro so you're basically getting $300 more bike "free". The MSRP of the GF is listed as $900, so you're getting $100 "free". I'm not familiar with these two bikes but typically big manufacturer bikes (Specialized and Trek in this case) in similar/same price ranges are fairly comparable. So knowing nothing of the bikes and your riding the best decision I could make is with the Specialized.
I suspect that there's nothing glaringly wrong with either bike.