I think I am qualified to comment!
I bought the exact same setup 6 months ago, reasonably happy with it but it wasn't as good as my rotel 971mk2' cd63kisig' mission m72 from 10 years which I s sold as I discovered macs and iTunes!
Anyway about a month ago starting to get the itch, I sold the pm6004 and bought a Rega Brio R....what a lovely amp, sounded great with the BX2s...or so I thought until I heard the Rega RS1....WOW what an amazing speaker..... Yes the BX2s are ok plenty of top end and low end but the Regas are more musical and not fatiguing in the slightest and found I was enjoying the music more! I have also heard the rega DAC with my cd6004 as a transport.....it gets even better with the rega DAC.
The rega stuff is amazing, it doesn't get the praise in WHF that it should, it truly is no frills good honest sounding gear.... Trust me go and listen to it!