Paul, if I were using it to gig, I too would prefer a 73-76, as I think it would cover 99% of your non-classical needs. Sadly, years of organ playing have left me with the finger strength of a two-year-old

, so I would probably prefer a semi-weighted keybed (hard to find in a quality '88'). Pricewise, I'd be more than happy to go lower if the unit met my playing and quality requirements. You should have no trouble finding a quality used DP in the $1k range. Just make sure you check it out thoroughly before purchasing. No matter how much it annoys the seller, make him/her demonstrate that ALL functions work properly.
Also, isn't it interesting how many older synth, workstation, and arranger users, are returning to their roots, piano, even if in digital form. It truly IS the king of musical instruments.
chas