Okay, Jen so I just checked the geometry chart for the Synapse 51 cm frame and see that the actual seat tube length is only 45 cm. And that was causing you stand over problems. So you really can't go above the 48 in the Moto if that large. That is more than one inch higher top tube. I am suspecting your torso is long compared to your legs. Moto doesn't make a smaller Ti frame than 48 real seat tube length. Maybe a carbon frame from a local shop (like the Synapse) would make more sense for you at this time. About the best deal on a Ti bike I can find for you in a size is the Everti Falcon or the Lynskey Cooper from Adrenaline with Apex group for $3,200-3,000, respectively. According to your earlier post thisis way above your budget. Perhaps the best approach would be to go with a reasonably priced carbon bike now and turn it around for a Ti bike in a year or two when you can afford the change. Of all the variables fit is by far the most important. If you can get that in a bike shop stock bike for a reasonable price, that might be your best bet.

Robert