Vangelis,

what exactly do you want to do with the controller? Use it as a keyboard? Use buttons to control synths ? What is your price range?

What Hitman recommends is among the best, have in mind that the Roland/Cakewalk things are virtually τhe same, the PCR range is 2-3 years old and the Cakewalk A range is 2-3 months old. PCR is probably cheaper now if you get an old unit. Both do not have ribbon controller.