I am thinking of activating either another toon, or full account to have a dwarf scavanger to earn cash (with spoils and manor system) but I do like my current character and not sure how hard it'd be to handle both leveling and gear wise.
Eh if your main isnt a buffer, no need for a new account. Just play em both on the same. If your main is a buffer might be worth to start a nuker on your 2:end account to lvl up your buffer. :D
Two boxing adds fun to the game, but can take away from it too; the decision is up to you. Gameplay will become more involved when boxing well, but a live healer is always more fun (and generally performs better than half your brain if he's not a total idiot).
Making another character is certainly always fun, but you have to consider whether you want to take the blow to your main's finances for equipping them.
For the manor alone, a class like the SK or a summoner is probalby more suitable than a BH. However, the spoils in catacombs, where you will most likely be seeding anyway, are very sweet.