Model: Nord Modular
Best Feature: Obviously the modularity. I went to this from a K2000R which has 31 algorithms for changing the wiring inside. It's pretty flexible, but the NM is just liberating.

Model: Roland Juno-106.
Best Feature: Ease of use coupled with excellent sound. A no-brainer to use. You can dial in a usable string, bass or lead in the same time you switch presets on a module.

-tek