Good suggestions here. I would add that you should give the derailleur hanger a close look.
Most - if not all - titanium builds do not utilize a replaceable hanger.
Also, pay close attention to the fork - typically carbon fiber.
Litespeed frames are incredibly sturdy, so any sort of head-on collision exposes the fork as the weak point.
My '94 Merlin will accept a 28 rear tire; possibly a 32, but I have yet to try.
And, thankfully, it came with a threaded bottom bracket shell. Avoid their pre-'94 pressfit!