You'd be amazed what a steal you can get on ti MTB frames from the 90s...I bought this for peanuts. The bonus is that I also think they'll have a revival and be worth money down the road (so will some of the steel ones for that matter). Anyway, I highly recommend it:
If you're interested, I have an early 90s Stumpjumper steel rigid frame I'd let go cheap if a certain other member is passing on it. It's a very nice frame.