Starkeeper, I'd take the 2100. Granted the 1500 is newer, the 2100 still has some good features over the 1500. The 2100 will run multiple insert effects, and if I'm correct the 1500 only runs one. This makes a big difference when recording. Also the 2100 will give you the vocalizer. I honestly think the 2100 will handle polyphony better than the 1500. There was this thread a ways back I posted about a buddy of mine regarding poly issues. If it were me I'd take the 2100 without question.

Squeak