<font color='#0000FF'>IMHO the only thing you need to do first is get rid of the booze speakers, they are the weakest link in your system. Use the money for good speakers and a seperate amp and see your system sing.
For external amps you can find the now discontinued Yamaha MX-1000/MX-1/MX-2/MX-830/MX-1000 at a great bargain on e-bay, the MX-1000 has been reviewed favorably by other forum members, you can also check out amps from Rotel, Bryston, B&K, Denon etc.
Do your receiver upgrade last when you have a good chance of getting the RXV-2400 at a good price.</font>