Howard,
Below are the specs for the amp's that i have powering my LFR's. I've got a smaller amp powering the rear drivers. you don't necessarily need the same amount of power available to the rear drivers as the front. The most important factor is that both amps would have the exact same gain. This is the guidance i got from Andrew when i was making my amp selection.
Amp powering the front drivers
8 Ohms 300 W 4 Ohms 600 W 2 Ohms 1200 W
Amp powering the rear drivers
8 Ohms 250 W 4 Ohms 500 W
You should be more than happy with the amps you chose. Oh, and with the power you'll have; the only thing you will need to worry about is tripping your circuit breakers (i haven't tripped one yet... ).
