I have a pair of Vienna Acoustics Beethovens. Music I listen to is jazz, classic rock, bluegrass. I love the clean natural sound. I love them, but feel I'm not tapping into their potential. I use them mainly for 2 channel audio and sometimes for HT. Powered right now by a Denon AVR 1803. Any recommendations on upgrading for better 2 channel sound? Should I go for a high end 2-channel amp or a better 5.1 channel HT reciever? Music is my priority.