There seems to be some difference in the quality of the sounds between the 1000 and 2000, however, I'm not sure if the difference is just a better quality amplifier in the 2000 vs the 1000. The 2000 live stings seem to have more fullness and depth in the sound produced. The best advice is to listen to both, side by side, but for the few extra bucks, I would go with the 2000.
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)