Yamaha A-S Series Amplifiers: Differences between the A-S1000, 2000, 1100, 2100, & 3000?

The 1000 and 2000 have evil spirits; don't purchase. The A-S1100 and 2100 are the best values and are great amps. The 3000 is ridiculously overpriced for what you get. There ... no need to watch.