i'd definitely prefer to buy an mc-101 over an OP-Z personally if you want something in the same sort of price range. if you can spend a bit more, i'd look into the dirtywave m8 if the workflow appeals to you. i have one and it's my favourite piece of audio hardware that i own.

of course virtually any computer with a DAW is the real best answer in terms of features and price, but i understand the urge to want to be away from a computer while creating.