now when the future of dungeonbank is questionable due to the lack of payments it's hard to recommend anything similar to them, bondagebank was ok until they stopped producing new content and only rotate old sets.
try these if you have decent bdsm traffic:
http://www.crankycash.com
http://www.bloodangels.com
http://www.paintoy.com
http://www.simplyrestraints.com
http://www.fetishvirgincash.com
http://www.ashleyrenee.com
http://www.strugglingbabes.com