I'm currently playing a Ketron X4 module with a Kurzweil SP76 controller (32 sounds built in). It doesn't have a real hammer/piano action (for that Kurzweil has good 88 key controllers), but its quality, weight/quality compromise and key feel is great. The ribbon controllers require a little while to get used to, but bending notes this way can be more expressive than with the tradicional bend wheel.

-- José.