Congrats! I just bought a 5.2 with Shimano Ultegra/compact double (worth every penny by the way--I wouldn't go below that on a 5.5 frame--I believe that's standard). What are you riding now? I was blown away by the difference between Tiagra and Ultegra. I've learned the components are what cost the money! Shifts like butter, even while mashing up a hill
We were shopping for a Madone with SRAM (that's what DH rides). Had trouble finding one, so if I'd had a choice (and you want to be unique), I'd do SRAM components.