Pow--I've heard mixed reviews of the Airborne frames--many excellent, some lukewarm. It's nice that they allow you to specify each and every component on the bike, and that they send it to you direct. Of course, you've got to find a way to get the right fit.
If you haven't already, you might want to check out the thread Road Bike Purchase
--there were some good recommendations there. As I said in that thread, I'd look closely at the Douglas-brand bikes sold by Colorado Cyclery, if I were in the market for a good value on a road bike. Like Airborne, they offer a full-titanium frame, as well as aluminum and aluminum/carbon frames. The prices are right, and the bikes get rave reviews.
It's a good time of year to buy bicycles....