I used Thomson for the first time last year because they are right around the corner from my new place. They did a great job, and did it very quickly. I thought they were a little pricey though... compared to Circle W.
When I lived in Milton I used Circle W, but I'm not sure if they still do game processing. They were great, and I didn't mind waiting a little longer because they were about the cheapest that I'd found.
At Circle W, I think it cost me about $25 to $30 (a few years ago) to have a 100 pound doe made into hamburger and a couple of roasts. At Thomson I spent about $75 to get a slightly bigger doe made mostly into hamburger and a little loose sausage.