I don't know all that much about the CVP210's features, but it does have auto accomp right ? I agree with Nigel that the Motif 8 would be a good choice for 88 key weighted keys and a very nice palette of sounds if you liked the CVP210.

It does not have any auto accomp features though, if this is important to you. It does have an arpeggio function that is pretty cool, but this differs a good bit from auto accomp.

I don't know of any higher end arranger types that would be portable and have 88 weighted keys. The closest thing that comes to mind is a Yamaha 9000 Pro, but it has 76 weighted keys. The sounds and accomp features in it should be on par with the CVP210

AJ