Another vote for the Synapse. Bought a carbon Synapse frame after owning my entry level Felt aluminum frame (carbon fork). While I liked the Felt very much, I love the Synapse. Being an older rider, a relaxed frame was just right for me. My sis has a Felt aluminum with carbon fork and seat stay, and likes it very much. She's 4'11".

Definitely try as many as you can within your frame size. Good luck and be sure to share photos when you make your final pick!