Couple things:
1. Contact with metal is never good. No blade steel likes to have its fine edge smacked into other hard surfaces. Avoid it if you don't like chipping and rolling.
2. Are you saying that your hinderer isnt tough enough to handle the tasks? If so, then Im not sure what you could buy that would be more capable. Those knives are made tough as hell, so they SHOULD be able to handle everything you need them to do. But again, you shouldn't expect the edge to come into contact with other hard surfaces and be completely unscathed. However, as long as you don't abuse it, I would think the hinderer would be plenty tough enough.
3. But if you're hell bent on getting another less expensive folder to beat on, I would take a look at the BM Contego. Big, beefy, badass, and with M4 steel. I have one, and it's a damn fine knife for the money. Got it used for 70 bucks! It can sure take a beating