Amplifier Recommendation for B&W Nautilis 804

I currently have N804's driven by Musical Fidelity a3CR amp and preamp. While I like the sound, I am finding the combo a bit lacking in weight, particularly in the bottom end. I'd like to see a little more punch in the music without losing detail that the a3 is known for. The A3cr is 125 watts into 8 ohms, and the 804's are rated from 50-200 watts into 8 ohms. I would spend up to 3000 for a noticable improvement.

Does anyone have a similar setup and/or any suggestions? Thanks.