I have roughly the same tastes in music as you do.
I listen to a lot of guitar players, acoustic, electric, from classical like Eliot Fisk and Sharon Isbin to guys like Vai and Satriani, new age ( Michael Hedges ), and they all sound great on the A8's. I listen to some jazz, stuff like Patricia Barber, Diana Krall, Miles Davis, and whatever else my wife has around and they sound great as well. I don't think they are the last word for large orchestral music, and I don't really like large orchestral music anyway, so take that for what its worth. I do listen to smaller works, various pieces of chamber music, and they sound fantastic to me.
I had the Super 3s and an Acoustic Visions MRS-10 sub and when the A8's came out, I ordered a pair. They didnt sacrifice any detail compared to the 3's, and gave me fuller bass. I was using the sub for a while with the A8's, but just for grins I took it out one day, and I haven't had it back in for a couple of weeks. I have them on the 12" Skylan stands.
The rest of my system consists of an AH! Njoe Tjoeb CD player, a Rotel tuner, an ASL AQ2004-DT tube preamp ( currently out of commission, I might not even get it fixed ), a Luminous Audio Axiom passive pre, and a pair of Quicksilver Mini Mite Monos at 25W each. I just got an Onix A60 MK II integrated solid state amp, and have had that in the system for a couple of days and its not bad, but I cant get the volume past 9 o'clock and stay in the room, so I think it will most likely be up for sale soon.
As and aside, I have the G3 in Tokyo CD with John Petrucci on the first 2 tracks doing "Glasgow Kiss" and "Damage Control" and it sounds pretty good. Actually, for a live show, I think that recording is awesome. The DVD is great as well, I highly recommend it. Your jaw will drop. Not only do those three ( Satriani, Vai, Petrucci ) doing amazing things physically, but sonically some of the stuff they do is unreal, especially Vai. He takes his songs places that are so unexpected and cool it just makes me laugh sometimes. Compared to the recorded versions, I prefer what he does live, as he has added some really cool parts to the last 2 of the 3 tracks he does.
Let us know