Speaker Recommendation Needed

A friend of mine wants to get a new system and I'm trying to help her out. Her room is pretty large: 20'x22'x12'. She listens primarily to classical music. She has heard my Spica TC-60's and loves the natural sound, imaging and soundstage of those speakers. Her budget for speakers is $800-$900. If we look for used ones on Audiogon, what can you recommend?

Thanks,

Steve O.