I'm in the same boat. PTT was cool at one time, but now I'm ready to drop it and get some type of 3G compatible BB, but my company on the other hand is still gung-** about PTT. I have waited for years to see a PTT headset, I don't think we ever will see one.
You could always get the wired headset off the sprint site. They have a PTT headset, I think it was 15 or 20 bucks last time I checked... heres the link just if you want to check. theres actually a few on there... Sprint - All Accessories
It's the only alternative I could think of. It really is a pain in the **** when driving and you randomly hear "BEEP BEEP... hey where you at?" and you cant find your phone quick enough to reply... but just figured I'd add the link up for those who are interested.
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