Hi,
a local LBS had some Ti spokes that had been laying around for years. No one wanted them. I did. I wanted to build a front wheel on my wifes bike with Ti spokes. Two LBS have discouraged me from buiolding the rear wheel with Ti spokes, despite the fact my wife weighs less than 120 pounds.
If you do, I would suggest, at a minimum, getting 32 spokes up front, and 36 in the rear.