I have a question for anyone with experience using external amps. I recently bought a pair of Axiom Audio M80ti 4 Ohm speakers. Currently I am using a Harman Kardon AVR 635 to run them. It is rated at 75w per channel and is doing an admirable job driving them. I mean really they sound great but I just can't help but think they might benefit from a more powerful external source. I'm really hoping sometime in the next few months to pick up an external 2 channel amp that will really make these sing. I've seen the Behringer EP1500 mentioned on these forums quite a bit. I'm on a VERY tight budget these days and the $200 dollar price makes this unit seem very tempting. Would this be a decent upgrade for me? Are there any other units on the market near this price point that might be better? Thanks in advance.