Best used five-channel amp?


I'm looking to upgrade my trusty Primare A30.5 amp to something a little more muscular a higher end.  I have a Classe Sigma-SSP processor and B&W 804s units for the front and an HTM3s for the center.  Does anyone have recommendations for used units?  I've been thinking about the Classe CAV 500 or the Theta Dreadnaught.  I'd like to keep it under $4,500 or so.  Thanks!
win200

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Thanks everybody!  I wound up snagging a CAV 500 for a very good price.  Question, though:  I was planning on placing it in my entertainment cabinet, which has held my Primare amp without a problem.  My concern, though, is that while the amp will have plenty of overhead clearance, there will only be roughly an inch of clearance on each side.  One side has holes drilled for ventilation, but the other is solid.  The back is open.  What's the risk here, and is there anything I can/should do to mitigate it?  It's probably impossible to place the amp anywhere else--challenging room.