Well, Rat, let me take a stab at it then. Hopefully I can give you some useful comments without getting caught in the crossfire between the warring factions here or accused by someone of trying to sell something.
Two years ago I bought a medium-duty, 72" Italian-made tiller from a local implement dealer called Leinbach's. It's probably pretty typical of the units being widely sold these days... certainly not the best made or heaviest, but it seemed to be a reasonable value.
After using it for 2 seasons on numerous gardens and some fields of up to 3 acres, it is holding up well. From what I've seen, the biggest enemies these tillers have are rocks and roots that jam. This unit has a slip clutch that has done a good job of protecting everything, and so far none of the tines have bent or fractured.
It does a great job in churning the soil. Greatest compliment is from the old farmer next door who asks me to till his garden after he's done his best with the disc harrow. We do have some good soil here and the tiller makes a beautiful seed bed, even from grass covered pasture, with 2 passes.
If you have lots of rocks, a tiller would take a beating, but otherwise a medium-duty one should be perfectly adequate for typical use. The heavy-duty ones don't seem cost-justified to me unless you are doing extensive commercial/ag work or are an equipment nut with excess cash (is that possible?).
Your 3830 should easily handle a 72" tiller, which also covers the tire footprint without concern about offset.
For the amount of use I give it, maybe in 10 years I will have to replace the chain and sprockets on this thing, but probably not before.