I was in a similar situation last year.
Regular work with several r&b/funk cover bands called for more "authentic" Moog-like sounds so I looked to keys. Plus, I think playing keys just adds to the fun and variety--there's only so many times a month I can play Boogie On Reggae Woman on an electric without losing my mind.
I played with some synth bass pedals at a local store, but I think that lasted all of five minutes before I decided there really was no substitute for keys.
So I started bringing a 61-key Triton (and sometimes Motif ES6) for the larger gigs because I was initially too cheap to buy another piece of gear. Then size and weight won out, and I went looking for a smaller keyboard.
I didn't think laptop, soft-synth, and MIDI controller would work because I wanted a dead-simple, 5 minute load-in for all of my gear. Too many connections.
Then I stumbled on a cheap microKORG. Great sounds. Some really fat patches, and good Moog analog sounds. (The board is chock full of trance patches though. I didn't use very many.) It even ran on batteries. But after a few gigs, I could not get used to the tiny keys. I'd always have to stare at my damn hands and really concentrate when playing a fast run or fill.
Then I read about the Alesis Micron and bought a new one right away. Even better sounds, I thought. Out of the box, there are several very authentic fat analog bass patches. You're correct that it isn't the easiest thing to program, but with the
micronAU audio unit on a Mac, it's quite a bit more user-friendly.
The Micron also had more assignable real-time knobs for control, but in reality, I was only using it for bass patches, so they saw little use. The horizontal pitch bend wheel was an easy transition. And most of the default patches have modulation mapped to one of the sliders for adding funky vibratos in your runs.
The normal-sized keys and small footprint, though, won me over in the end. I passed on several opportunities to buy a Little Phatty Stage because it's just too large to justify carrying around to gigs.
Through a 410 and a two-channel LMK head, switching back and forth is a breeze. And it sounds absolutely huge:
There are better soft-synths for recording. And more "baller factor" boards like an authentic Moog to look nice sitting on stage. But I think the Micron was a great compromise, especially at the price.