Scott,
For what it's worth -- check out the Roland FP3. It's a lightweight, 88 key, weighted hammer action, FANTASTIC sounding portable digital piano. Of course it has midi and effects, but the REAL plus is the built in drum machine/arranger. If you really need a piano feel, or the extra keys for showing off -- this is my new favorite. I used to like the Yamaha P80 the best, but this is better because with the push of a button -- you have split bass (or arranger) piano & drums. It's very small, not too heavy and sounds as good as any of the digital offerings out there today.

I too, do not like to bring two keyboards to a job but every now & then .... Having the organ or the piano underneath the synth is pretty cool. I only do this in a band situation -- never alone. It's not worth the extra time, bulk or changes in performance as a solo.

I'd rather play a good digital piano than a fair acoustic anyday.