What size dog cage for your staffie?

We are great fans of the Showman dog crate produced by Crofts and it is reasonably priced at under 40, apparently it has been a favourite of top dog breeders for almost 25 years. It is finished in an attractive gold coloured zinc plate, and is available in a number of sizes with a choice of door positions. We have bought three of these where the just the short end door opens up. We normally insert a Vetbed inside, but depending on the wash cycle, it might have a fluffy blanket instead.

Size of crate:
Dogs: 31ins x 21ins x 24ins high
Bitches:24ins x 18ins x 21ins high