I have Better Living dispensers.

http://www.dispenser.com/

They're available at Bed Bath & Beyond. The mechanism is very good, and I think any style would be as good as the one I have.

I really, really like mine. the only bad thing: It's directly under the shower head, so it gets a lot of splash back, and water seeps in under the lid. Maybe other designs won't have that problem; mine has a single long groove in the back that the water sits in..

I have a single mounted to the wall over the tiny, tiny bathroom sink for handsoap. It's nice!

This is the one I have--only I have a 4-chamber one (which they don't make anymore). That may be part of the water thing. I wish I'd mounted it off to the side. I may just run a bead of caulk there and peel it out when it's time to refill.

http://www.dispenser.com/clearchoice-III-chamber/

I think their other styles might not have that same problem.