Here are the specs for the Cannondales:

http://www.bikepedia.com/QuickBike/B...ck+4&Type=bike

http://www.bikepedia.com/QuickBike/B...ck+5&Type=bike


I'd rule out the Giant Escape 2, so the choice is between the two Cannondales. Either of them would be fine for 10 mile round trip commuting. Yeah, the 2009 Quick 4 is probably worth the extra $59 bucks over the 2010 Quick 5. I doubt you'd be able to feel any difference with a carbon fork with tires as thick as the ones on those bikes, but the other parts seem a bit better across the board. As far as sizing goes, keep in mind that a small, medium or whatever from one company isn't necessarily the same as a small, medium, etc. from another company. The bike shop should be able to help you with the correct size.