Whats the low down on Humidifiers?

[stylingpat]

I cant seem to find the low down on room humidifiers. I'm trying to just raise my humidity 10%-20% in my spare bed room. Some people are saying go with a warm-mist some say an ultrasonic but only if you got RO water. I dont mind spending say $100 either on a real quality one.

I'm growing under (2) 23w CFL's. Got about 6 or so plants on a side table with a light fan on them from the other side of the room.