I have a Novation Remote Zero SL (without the keyboard). Honestly, I don't use it much. Auto-mapping looks cool but I'm pretty used to toggling everything by mouse. I used to own the Novation X-Station. It was pretty nice but the sounds weren't anything to write home with -- it sounded like a decent softsynth, nothing like a Virus or anything. I only had it for a few days, but you might have more luck.
If anything, the Novation line has good build and good keyboard action. I would stay away from the M-Audio and Behringer models -- they feel really cheap.