I am currently looking to buy some type of amp to push my main left/right speakers when listening to music, however I am not sure what I need to do.

Here is what I am running currently:

Receiver-Pioneer Elite VSX-94TXH

Center- Infinity Beta C250

Front Left/Right- Infinity Beta 50's

Rear Left/Right- Infinity Beta ES250's

Sub- Klipsch Sub-10

The system already sounds great with movies and music, I would just like to be able to push my Beta 50's a little more when listening to music. Any advice on what I should look at to accomplish this would be appreciated.

Thanks