I just had a little debate with OldMiniBikes member Mike R. about jackshaft vs TAV. He has a new Bad Dog coming. I think he has your model or the one up (I know he has the one down from mine) which I have a TAV on mine now, but I was saying how much I like the PMR jackshaft on my Lil Indian. It would seem to me, a large frame bike like that (and mine) would be excessively demanding on any straight clutch n chain setup. Without knowing your gearing which would have to be precise to minimize the excessiveness, a big bike like that might be an indication to use of a TAV or jackshaft.
At any rate, I like both drive systems. You would benefit from either. Mike R. didn't dig additional chain, and probably if you have significant hills where you ride, a good cut to the chase would be just get the TAV. Both around a hunnert bucks.