I would definitely go with 88 keys if the weight was acceptable doc-z. The only reason I am pushing for 76 keys (as opposed to 88 keys) is because I don't think Yammie and the others could keep an 88 key high-end arranger at an acceptable weight level. I recently bought an 88 key Casio Privia 200 that had 128 note polyphony and other advanced features and it weighed just a tad over 26 lbs. But when I realized that the Piano sound and many of the other sounds were not top notch I returned it for a refund. But if the sounds had been better I would have kept it.

If Yamaha, Roland, Korg, etc. could make a top notch 88 key high-end arranger that weighed in the neighborhood of 30 lbs or so I would be the first in line to snatch one up. That is, if all the other features and sounds, etc. were top notch also.

If the manufacturers can't oblige with a light weight 88 key arranger I would still be quite happy with a light weight 76 key arranger. But you are right doc-z, 88 keys would be optimal and desireable if they could keep the weight down. That's my opinion anyway.

Best,
Mike