I don't agree with you entirely on aluminum baffles. They can serve a purpose on lightweight handguns, but you don't want them on your primary rimfire suppressor. Their are ways to clean them easily, but SS baffles do have more options. As for Huntertown, stay FAR away.
If an NFA item is bought as an individual rather than a trust (or business) and the owner dies, the item(s) will transfer tax free on a Form 5. But anyone getting into NFA items, I would highly recommend going the trust route. Suppressors aren't really bought, sold and traded like common pistols just because of the paperwork involved. Since these purchases are typically kept a very long time, the difference between a low end suppressor and a higher end, nicer quality brand really isn't that much. When you're talking about .22 suppressors, it's usually only about $150 difference. Just buy quality to start with.
I have a Huntertown arms guardian 2 it works great and can be had $200 or less and gemtech outback 2 less than $250. The Huntertown on M&P 22 and outback on M&P compact.