I've had an 89 since they came out and it's been well worth it. Using it on the SAT's alone was worth the purchase price. Ironically enough, as a math major I don't have much use for it any more, but it still comes in handy. I'm not sure if the features of the titanium one make it worth waiting for, but if you think you might need them then wait.

There is of course the HP/RPN cult, which you can consider joining, and I'm sure someone here can tell you why you should.

Matthew