One of those huge dry sift tumblers would be pretty damn sweet. Throw the shit in and let it tumble. Then press it into pucks. Bubble hash would probably go for more cash though.... it depends I guess.
when i say cheap....i mean if i was doing bho it would cost a few hundred to a few K to make which is way too much.....if doing it with a solvent i would prefer to use something that is cheap on the wallet....for 10 lbs of material atleast....
Purest = Iso (or BHO if taht is your choice)
Largest Yield = Dry sift
Best combo = Bubble.
Dry sift will be the cheapest, easiest and quickest.
Iso/BHO is more pure (potentially) than Bubble, but takes longer (as you have to purge) and potentially very dangerous.
Bubble is the best (imo) only if you are separating the grades, but is the most labor intensive, even when using a washing machine to do the mixing.