Here's my situation:

I have three heating devices. Two UTHs (hot/cool) and a CHE for ambient. I've been using rheostats for a while now, but I'm not impressed with the amount of adjustments I have to make.

I was thinking about getting a thermostat. Thinking cheaply, I was going to get two 500r's. (The CHE and cool UTH are usually at the same level on the rheostats anyways). Then, I would use the rheostats as a backup in case the 500r's failed. Would this be enough? I know people don't like them so much because of the temp fluctuations. Are they really that bad?

If I was to go higher quality, would my only other option be a Herpstat II? Can I plug in the CHE and a UTH into the same output? I know a Herpstat will minimize the temp fluctuations, but it is necessary since I'm not breeding or anything (I have one bp).

Are there any other thermostats that have two or more outputs?