Trying to choose between A90 (which I've heard) and A22/A32 (which I haven't) driving BW603s. Has anyone got any advice/opinions either way negative/positive wise to help me choose between them? I've heard the FMJs are a bit sharper or drier. I liked the warmth of the A90. Is that still there? One review suggested they preferred aspects of the A90 over the A32.