Olk school USAmps (circa 1994-ish) are AWESOME, low-impedence amps. No question. I would NOT (personally) put them on a set of mid/highs again. However, thats just my opinion.

You want something HIGH end, and sort of "exotic"? You will have to PAY to play, but look at Helix or Genesis. A bit more mainstream, and I might suggest ARC or Zapco. Something "common" but good, try Polk Audio, Memphis, or Rockford. Some "crap", try Dual or Insignia....