i wouldnt recommend the impulse. never really played one, but ive heard lots of bad things on the web. Th SLs are pretty nice, aside from Automap being nonRE compatible, unless you build custom maps.
Having a BassStation could be pretty hot too. Relying on software for a sound module is never 100% reliable, having a controller that just sings on its own is always a backup plan.
MS20 mini, XStation, Monotribe, MalletKAT,
Reason, Recycle, Reaper, Tassman, Chromaphone,
Radical Piano, ReTron, Antidote, Polar, PolySix, Buffre.