My Pioneer 36tx requires an external amp for the 6.1/7.1 setup. I think I'm finally ready to make that step. I've not picked up an extra pair of speakers yet, but I'm starting to look into amps. Anybody have any suggestions? My system runs at 100w per channel so I'm looking for an amp with at least 100w per channel that will support 2 speakers. I'd also like this to be a slim amp so that it does not take up much room in my rack.