If you plan on feeding these to snakes I highly recommend going with a true meat rabbit(I prefer Californian & New Zealand's). Non meat rabbits don't carry the same muscle mass which translates to less meal for the animal. Also true meat rabbits grow to size quicker than non meat rabbits.
Not sure on the Mazuri 6f, I feed Purina Professional and GRO feeds. They run $13-16.00 a 50lb bag. I feed the growing rabbits 18% and the males and non birthing females the 16%.
Also you need to keep in mind that rabbits are temperature sensitive. They also crap and piss a lot! You will need a place to get rid of all of the wastes. It makes great fertilizer.