I've got a Denon 3802 driving Klipsch speakers and want to add separate amps. The nOrh Le Amp seems to have gotten some praise, as has the Marantz MA500 monoblock. I'm not sure if I should go with monoblocks, or something like the Denon POA 5200, a two channel amp. Advantage of monoblocks is that I don't have much money to spend right now, but can always add more later... What do you think? Any amp recommendations under $500?