Fit is First when looking for a dedicated touring bike. TT length is most important for long, comfortable daily miles. Nail size down by visiting local bike shops. telling them your budget, and the purpose for the bike. They probably won't know much about touring bikes, but can help determine frame size in cm.

If the lbs can't work within your budget, check out bikesdirect.com. Or, patiently search Craigs, etc for a good deal on used.

A frame build out is very likely the most expensive solution.