Need help w/ B&W CM2

Looking for advice to help tame that harshness that comes with bright recordings, top hats, crashy cymbols, and pronounced 's' sounds in voice. My friend is using the B&W CM2s and NADc370. I know a large part of the problem is the metal dome tweeter, but he'd like to try some different amps before giving up on the B&W's (they look too damn good). Price range should be around $500 used (could probably go higher but lets start slow) and ultimate volume is not a big issue since they are only occationally played loud (the 370 was overkill). A remote control is preferred but not necessary. I was thinking tubes- Cary, Jolida? hybrid -Jolida 1501? SS- Rega, Linn, Musical Fidelity? I have no idea what is a good synergistic match w/ B&W. I've heard both arcam and rotel with B&W and noticed some harshness with those as well. Please help!!!