The Monsoon works nice as long as it is not one of the 1st generation ones which had leak issues inside the unit causing timer problems. If you receive a 1st gen one, Exo-Terra will replace it if you are having the timer problems.
The Monsoon would need to be something seperate outside the tank and then your use of the overflow for a waterfall would work well. I have the Mist King system and the base model is about 199 USD but you need to set it up with a bucket hidden under the tank if going with the Mist King. The mist King is quieter, and with the ability to use a separate bucket for the water supply, you don't have to fill the supply bucket/container so often.
The Mist King nozzles also provide a much finer mist so you would normally have the pump run a little longer with each cycle.

As for the lighting, as long as you use some 6500K color temp bulbs or better then you should be fine with the lighting you have plus the additional you mentioned.