Playing 'World in my Eyes' off Depeche Mode's 'Violator' album right now - this is a fast pace song and the FMJ and Wharfe's are grooving along nicely to this. I keep reaching for the remote to crank the volume up There is plenty of attack, bass and detail here.
Agree with you on the qualities of the Arcam versus the Marantz - the PM6003 was wallowy, wooley and just lacking in much enthusiasm and detail. The Arcam was the complete opposite and well worth double the asking price of the Marantz (especially as I got £145 off as it was on offer).
I reckon you'll love the combination of the 10.1s with the A28. The 10.3s use exactly the same size drivers, but are the floorstanding option. Build and sound quality of these are way higher than the very decent asking price.
Enjoy the music too, SSM