RE: what traditional ml would be a good one to start with?
Again I have to agree with Cayugad. Either the T/C Renegade or the Hawken are both excellent rifles and good used ones are fairly easy to find. Only one additional comment. Check your state's regs for hunting. Some primitive seasons only allow the use of flintlocks (PA for one). If the percussion is legal I would suggest you try that first. The flinters take a bit more getting used to and are a bit more finicky if not loaded (frizzen) properly. Most of the 'delays' you hear about are from people filling the pan too full and getting a fuse type effect.
I don't even own an in-line anymore. All my MLs are sidelocks (and all are T/Cs).