A B68 (unsprung) or B67 (sprung) would seem to be the ones you need to look at.
Also consider looking at Lepper saddles which are Dutch leather saddles that use mattress springs instead of tensioned leather. A lepper saddle will cost less than a Brooks and doesn't need to be broken in. It took me over 1000 miles on my Brooks flyer to make it more comfortable then the Lepper Weltmeister on my other bike, the Brooks is however more comfortable now than the Lepper ever will be.