Keep your PSR2000. I own the PSR2100, and I got it because the extra money was no sweat, but the PSR2100 has very few advantages:

500kb of flash ram
about 20 new styles that are nothing extraordinar since anyone would share with you to use on your PSR2000.
About 15 new voices, the only really notable ones are the Live! Piano and the new nylon guitars. The harmonica is pretty good.

Nothing else new. The most disappointing thing is that the old styles from the PSR2000 are not revoiced with the new voices. This was disgustingly lazy on the part of Yamaha.

I don't think anyone in your audience who heard you with the PSR2000 would notice that you bought a new keyboard.

The PSR3000 will be an additional $300 or so, and you will get so many extras.

I think that between now and July you should be able to save up the additional money to get a quantum leap improvement.

Let me be emphatic. The PSR2100 is not worth the extra money.

Beakybird