1.5's or 1.75's. Either will work well for coons and foxes. Make sure you get offset jaws and lamination is good too. For coons (and mink / rats) in pocket sets in stream banks, I'd look into getting some #11 doublejaw longsprings. They are VERY coon friendly.
Coon cuffs, Griz Gettr's, etc are excellent coon only (and dog / cat proof) but the buggers are EXPENSIVE.
"Knowing when to shoot and when to wait is one sign of maturity in a bowhunter. Be patient and pick your aim point carefully." ~ Randy Ulmer
"I suppose it's the way of hunters. We are very odd fellows." ~ Peter Hathaway Capstick