I have a Kenmore 50 pint model from Sears. It's $200 now, but I paid less than that because it was on sale. I just checked and the reviews on Sears.com are terrible for it, which surprised me because it worked pretty well when I was using it. I was living in the basement of a house with no air conditioning for my last two semesters of undergrad and when I moved in it was so humid that the walls were wet.
I bought that dehumidifier and it really helped. I kept it in the door of my room so the hot "exhaust" went out into the rest of the basement.
It'd fill up the water container every day. It ran constantly it was so humid down there. Since I'd go home some weekends and it'd fill up and shut off, I finally went out and bought a length of hose and hooked it up to the floor drain. I made a little stand to elevate it so the water would drain. That worked great.
It was not a big room, maybe 15 x 15. The humidity was just really bad.