Remember that the more you pay, the better the weld quality will be in general. Titanium frames fail at the welds if at all.
From Thorn Audax Mk3 brochure - grain of truth or total BS?
Titanium frames are fairly light, they
ride very well but it is extremely
expensive to have the required fittings
and furthermore, all titanium frames
that we have known, have also broken!
It is usually impossible to repair a
titanium frame. Perhaps there are some
titanium frames, being made today, or
which may be made in the future, that won’t break... but we
doubt it. We certainly wouldn’t want to risk such a huge sum
of money, when steel is almost as light, much more durable
(and could be easily repaired if necessary), rides better, is
relatively inexpensive and a steel frame
can have all the fittings you require.