if your set on the MB's, then ask Tim Cravens what he would use for the 3 critters you want to trap, he will give you the right answer since he's a trapper and makes the traps. theres a million answers to this question. I think IdahoSawtooth has the right answer, get cheaper traps so you can get the other important stuff you'll need for trappin. personally if I was going after the 3 aboved mentioned species, I would use a #2 bridger, as any trap size bigger is too big for fox, and the #2 will work for all three. good luck and happy trapping.