IMHO you should just max out TKM or BH, and too top that off I would do TKM. My reason behind that is your trying to maximize efficency of offense. Being a master in either BH or TKM will make you a force to be reckoned with. The only reason I would stay away from BH over TKM is it takes more skill points to learn and as a TKM/CH master I can take down most npc's except for the really crazy ones with ridiculous HAM's.
The combo I would go for is TKM since they deal damage out and can soak a nice chunk up, and I would also do rifleman/sniper, and work up to ranged damage mitigation 2, this combo should leave you with enough skill points to either get some medic skills so you can heal yourself on the field or pick up ch and have some tanks with you.
BH is very cool, but from what my ingame friend have told me the amount of skillpoints required cause it not too be worth it. But on the other hand it is a game uber means nothing and you should just go out and have as much fun as you can. If that includes being a bounty hunter cause it appeals too you then that is what you should do my friend :)