You know...I had similiar buyer's remorse after purchasing my second road bike. A year later, I ended up selling it because I never got it quite right and if it doesn't feel right on a ride around a parking lot, it's going to feel REALLY REALLY wrong after 100 miles.

I agree with Knot - go test ride that Trek again and see. Maybe it's not as perfect as you are imagining it and it would be a shame to do anything with the Orbea until you know for sure.

Secondly, it may be worth giving this a little time or at least a 10-20 mile ride. I agree that with flexiblity and strength changes as you get used to a road bike, you may find that you are comfortable on the more aggressive geometry. Some find this is true, others, not so much. It's very individual. And sitting on the bike is VERY different than riding it. Take it out for a spin and see.