The only solid state amplifer under $500 I've heard Paradigms with that sounded nice was a Denon POA model amplifier(used $300 to $400). It will sound much better than the Denon reciever you're using now. You can use the reciever as a preamp until you decide on a seperate preamp. A tubed preamp will help. A tubed amplifier will help even more! The only one I've heard on Paradigms was a Carey v12..probably the best of all amplfiers listed here.
The Rotel amplifiers sound decent,The Odyssey Stratos and Denon were the best of the 5 solid states listed too my ears. Stay away from Adcom and Bryston unless you like hard highs, fatiguing ,dry and forward sound(just not good matches IMHO). A Class D amplifier could be another very good option for less money. Ultimately you must find out for yourself.
Have fun
The Rotel amplifiers sound decent,The Odyssey Stratos and Denon were the best of the 5 solid states listed too my ears. Stay away from Adcom and Bryston unless you like hard highs, fatiguing ,dry and forward sound(just not good matches IMHO). A Class D amplifier could be another very good option for less money. Ultimately you must find out for yourself.
Have fun