I would try with the UTH first and see if your ambients get to around 80*. If not, you could either get another UTH for the cool side or a CHE on a dimmer. The only problem with a CHE is that they kill humidity like there is no tomorrow.
Test it out and see. It really depends a lot on your climate.
Amen to that. I held out as long as I could before using the CHE, but it was a must. It was time to break out the humidifier...in May.