If you live in Aust and want a custom bike go to Steve Hogg in Sydney to be fitted first. I say bike because the frame is only part of the equation. I bought a Baum through a so called reputable fitter in Melb and had to buy another one once I had been properly fitted by Steve. Mine is the Espresso (steel) and a real joy to ride. If you have lots of money certainly go with the Ti but most of us mere mortals wouldn't notice the difference. Good fit and smart training will make the biggest difference. As Steve's motto says Comfort + efficency = performance.
Good luck and enjoy the experience a good custom fit brings.
Cheers
Hainy