Actually, until i got it for a keezer, and then subsequently put my keg fermenter inside it just for s's & g's, I thought a chest freezer was just about the worst idea for a ferm chamber. Now I will be getting another 2. My bottom yeast dump is easily accessible since I built the collar into the lid, instead of the other way around. Easy.
You could get a chest freezer that is pretty much exactly the size of your fermenters, plus 3 or 4 inches around. There are so many of them out there and they're cheap on craigslist.