I can't for the life of me ever remember when I needed more than 128 notes polyphony...

For Pete's sake! Has ANYBODY ever heard a 128 note arranger dropping out?

If you need more than 128 notes for any arrangement, and that would be one humongous overkill layered up mess , you would be FAR better served with two different manufacturer's 128 voice keyboards... Twice the samples is better than twice the polyphony on the SAME samples, IMO