MERLIN TSM-M and surround speakers?

I have the Merlin TSM-Ms (left/center/right) and I would like to put in some rear surround speakers for Home Theater. I don't have the $2500.00 for TSM-Ms in the rear (and I think that would be a sin) but I would like to have rear surround speakers that come close to matching the timbre of the Merlin's. Has anyone dealt or is dealing with this problem? I would weclome all suggestions, recommendations, and thoughts on this matter.