Like many others have said here, 1 1/2 coilsprings and #11 long springs are your best bet when dealing with coon. Double Jaw is perfered. Dont worry about always having to drown the coon, but do it when you can. You can catch tons of coons away from water, such as out by the cornfields or along the fencerows. Make a dirthole set and bed the trap up close to the hole and slightly offset and inch to the left or right of the hole. Have the dog facing at a 2 oclock angle at the hole. Add lure or very sweet smelling bait. Do not worry about overluring because you can NEVER overlure coon as to what you can with fox and coyote.
BUT if you dont want two seperate traps for each animals you can use the exact same trap for bobcat as you can for coon. A #2 or #3 would be good for bobcat. I use 1.65s for fox and yote and bobcats shouldn't be much bigger then a yote...
Many trappers have caught coons in sets intended for coyotes so you can see you dont need to drown them. Its a proven fact! And no those traps aren't that big for coon, sure if you use os traps, smaller coon will slip out or if you get a toe catch but for the most part, yes you can use the exact same trap for coon though some might find it hard to believe...
As far as the best brand it would be dukes for 1 1/2 and 11s since their the cheapest and make sure you get the NEW STYLE of dukes. Never get the old style. The new style is built better the pan is even with the jaws which will help out alot. You could try dukes with bobcat but you would need some modifications on the trap, such as double swiviling through the chain, base plated,and so on. And make sure your traps are four coiled.
I like off sets because the keeps the blood flowing throughout the paw and doesn't cut off the circulation which numbs the foot and cause the animal to chew his foot off. But that isn't a problem with cats....Also helps with farmers concerned with pets and put them more at ease when you show them the trap and set it off on your hand that it wont hurt pets
Some sets you could use for them. Coon: Dirthole,pocket set,pvc set,cubby set,bucket set, and blind set. Always gange set the area too. Usually coon can be found traveling together so you catch more coon. Check along the creek beds in the sand and make a pocket set or pvc set if the land is flat and you can't make a pocket set. Look for trails leading to cornfields and den trees while watching out for tracks and scat. And place a few traps along the trail and use a slide wire to drag the coon from the trail so he won't tear it up and you can keep using the same spot.
Cats: From what I heard from other trappers, they catch the majority of their cats in cubby sets. Also use some type of flagging to attract the cat to the set. They hunt more by sight then smell like what canines do. You can use orange flagging, a birds wing, anything of such to hang in a tree above or by the set to attract the cat over to the set.
Also I highly reccommend snares. Alot cheaper then traps and you can set out 3 times as many and catch animals that you couldn't catch with a leghold trap. Their a great thing to have on the trapline.
Best of Luck! /ubbthreads/images/graemlins/smile.gif