Al, here's a unit that's on sale right now and comes with 2 sensors - you just rotate the wheel on top to switch between sensors. I've been using an Oregon Scientific unit with remote sensors for quite a while and have had no issues with it.
(Make sure when you shop for sensors that they include humidity - many are temp. only.)
http://www2.oregonscientific.com/sho...id=122&pid=869