Note thet the altimeter and barometer are really the SAME sensor, so it really has three sensors.

I have a Casio pathfinder model and find it to be very useful, although a bit large.

If you watch www.steepandcheap.com you can find the High Gear Alterra watch for around $70. They seem to have it about once every month or two. Picture here: http://www.basegear.com/alterrawatch.html