What are you petite gals doing for TT frames? I would like to get a dedicated TT bike, but I'm not certain what my options are at 5'3". Right now my main race bike is the Specialized Ruby Pro which I have in a 48cm frame size. The top tube length is about 50.6 measured horizontally from center to center. With these dimensions am I going to be stuck with 650cc wheels in a TT machine?

At this point, I'm not looking for a souped-up carbon racing machine like the Cervelos. Although they are ultra-sexy, the price is out of my budget. I'm looking more in the $1200-2000 range. Any suggestions on what bike brands to look at?