I did a search here first and didn't come up with much.
From reading other sites, this seems to be the best purchased composter:
Exaco Trading EARTH Earthmaker 120-Gallon Three Stage Aerobic Composter
I've got one one composter, an old Smith & Hawkins one that was highly rated. It does a good job. I keep things turned.
I'd like to switch to something like the above to get the compost started and mostly broken down. When it's in the lower chamber, move it to the Smith & Hawkin for its final stage and storage.
Any ideas? I'd prefer a purchased one for the space I have rather than building large bins or bins you have to keep moving around to get the good stuff that's at the bottom.