I use copper humidity trays under many of my pots. The catts are in one, and the mottled leaf paphs I just set up in one yesterday. Oh, and two others are in a round one. I also have some plants where the pot sits in a larger cache pot and I use those little glass marble things (the ones w/ the flat bottoms that Pier 1 sells) and put a teeny bit of water in the outer pot, not so much that the inner pot touches or sits in the water.
My humidity, depending on the day, is anywhere from 40-70%. If it is a really moist day, sometimes a little higher. Lowest I've had was 25% in the winter, but that was a rare occurance.