I have an Avid Artist Mix which actually works quite well in Cubase. Maybe you can pick it up second hand for a good price.
The Presonus Faderport is rumoured to be quite good for Cubase also.
Actually my favourite Steinberg controller is the combination of CMC-AI, CMC-CH and CMC-TP. I actually prefer this over the CC121 since the buttons are bigger and nicer to press, and in total there are more programmable buttons. Since Steinberg stopped making these, they can be picked up REALLY cheap secondhand if you are lucky. These handy units combined with a nice fader surface like Artist Mix or Faderport 8 can be a really great combination.