The Arcam is none of those things. For that, yes the Music Hall is a better choice. The Arcam is a high energy player, lots of dynamics and bit retrieval, incredible prat but laid back, never. It's a very engaging player and I have no classical music so couldn't tell you. Jazz, blues and rock diet for me
Reviews seem to be pleased with the A2 sound overall for the price. It's not an M-Audio but it's not crap like the A1 so I'm not sure the MH will be a night and day difference. Like I said between the Revo and MH, the Revo was the better one for soundstage and laid back easy going bit retrieval. But being better in that way for me was still the wrong direction.
I use my Arcam for music now 24/7, heck even deleted my lossless collection off the PC
Maybe you could buy the MH and a Revo, compare and keep your fave.
Hmm actually another idea would be to keep using your PC as a transport and use a Bel Canto DAC1 on an optical connection. Be about the same price as the MH but betters it in the ways you are looking for. The MH is dry and laid back, the BC is liquid but still laid back. So it would be more involving without slamming you over the head with it.
Oh about musicality, to me dry players like the Music Hall and M-Audio aren't very musical since they don't engage me. I tend to place them in the 'background music during dinner party' variety. They are there but don't draw attention to themselves. Something I can't live with longterm. I never really found myself forgetting my main task and starting to tap my foot or bob my head with the MH or Revo.
For laid back, musical and not brute analysis but full bit retrieval I'd look into the Bel Canto DAC1. I think it would best suit your goal. The Arcam is too dynamic, the Music Hall too dry to be musical when compared to other players/DACs, the Revo has more or less the same faults as the MH but also shares its strengths and comes with a low gain amp in the same quality range as a wall powered Meta42. So the Revo has a high value rating but like I said I think the Bel Canto is your bliss.
Anyway good luck, and remember to buy used if you can. Beauty of the used market is turn around. If the player doesn't suit, you sell it and lose nothing but shipping cost (~$10) which makes trying a few then deciding quite attractive.