I find myself riding on more pavement than dirt these days and a full-suspension mountain bike with knobby tires is getting old. I'm looking at buying my first road bike while I'm on here in California for work and could use some opinions and knowledge from a few riders. Budget is around $7-800 and I'm okay with a used bike. Craigslist is pretty barren but there are a few shops out here that have some used bikes and a new one that seems promising.

Used:
2011 GT GTR SRS 1 - Asking $850
Al Frame
Carbon Fork
Ultegra Groupset

2007 Douglas by Colorado Cyclist - Asking $1000 (I'd have to see if he's willing to come down in price)
Ti Frame
Carbon Fork
Ultegra Groupset

New:
2015 KHS Flite 450 - $820 OTD incl tax
Al Frame
Carbon Fork & Seat Post
Tiagra Goupset
Mechanical Disc Brakes

Has anyone had experience with online vendors? Bikes Direct seems to have a decent following if you're not concerned with a name brand. A few bikes fit my price range and have decent build sheets.
http://www.bikesdirect.com/products/...road-bikes.htm
http://www.bikesdirect.com/products/...ntnoir_xii.htm

A buddy recommended mybikeshop.com for buying used bikes online, any experience with the vendor?