Not sure if you already picked up a tumbler or not but thought I would share the one I use.
I bought it with cabelas points a couple years ago and it works awesome. I haven't had any problems with it yet and I have done thousands of pistol and rifle rounds through it. I did upgrade the separator pretty quickly. I went to a big plastic colander that I picked up at the local dollar store. I can sift through the brass much faster with less mess.
The unit is fairly quiet although I dont use it while I am loading. I usually turn it on when I go out running errands. Takes about 2 hours to get moderately dirty brass clean and range brass takes about 4 hours. I am still using the cob media it came with although I have added some walnut media to it so I have about a 50/50 mix.
Walnut shell media and corn cob both are much cheaper at pet stores. I have a friend who picks up 50 lb backs for about $20.00 and I get a gallon ziploc back from him every once in a while. I guess he thinks I use it faster than I do because I have about 5 bags laying around.