Heh....with great respect, Perrone, the Vyper is a bit expensive to use as a bottom timer. If he's doing strictly technical diving he doesn't need a computer at all. But lets not go there.If he is going to honestly do technical diving, he won't be using a computer for anything except to show his depth and dive time. The Vyper would be perfect. That's what I use and so do many of my friends.
Wrist mount is no more expensive than console mount. Or maybe only a few dollars. Why did you think it would cost prohibitive?
check out the D9 --
Suunto - Suunto D9 Story - SUUNTO D9 - Diving Instruments