Receiver/Power Amp Question

Will I be wasting my time and money added a powerful 2 channel amp (<$1500) to an Onkyo HT receiver? The main purpose would be for 2 channel music. Not really caring about home theater any more. Nola Boxers in medium sized room.

Don't have enough for separates at the moment - just trying to maximize what I have now. THinking of adding a Parasound classic 2250.

Thanks!!!