I'm considering purchasing a K2000. I will often be using it in place of an orchestra and yes, I do realize no synth can totally substitute for real instruments and musicians. I will be doing orchestra and big band arrangements for singers along with film scoring. Full orchestra sequences will be created and then they will be recorded for various uses.

I'm concerned that the 24 polyphony will be limiting when playing back sequences of orchestral arrangements through the K2000. How many instruments can the K2000 realistically play without any external modules? Is this maybe not the right keyboard/synth for my needs?

The K2500 or a K2000 plus a separate sound module is way out of my budget right now. The other alternative is a 64 polyphony Roland XP-80/60 with expansion cards.

Thanks for any advice.