How about another Classe CA 400?
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If you don't mind the heat the KSA-250 will put out it will more than control your speaker. I used them on old B&W 801 Matrix 3's (89db efficient) and the KAS rocked! This amp can easily drive a 2 ohm load; you will have no problem. I used a Jeff Rowland Consummate preamp and I think of all the equipment I have been through; Krell FPB 300; 600, KPS-25sc with FPB 650 monos, then FPB 750 mono's with a KCT and the KSA still holds its own. If you have a good musical preamp and good cabling you will be please. My favorite all time Krell system was my 750 monos and the KCT. Wish I still owned them to drive my Wilson MAXX 2's; best bass ever.
I was looking for a second 400 in silver but they are in tough shape for the money being asked.
I am not into 20lb for $2000 class "D" stuff,at least not yet.
I have a chance to acquire a KSA 250 in good shape and was recapped in 2008.I have had a Bryston 14bsst but wanted to try the Krell bass and I am not sure if the 250 will be close to the low SPL of the 14.
Don't know about "best" in terms of sonics but one of the best values would be a used Eagle or EKSC. The Electron Kinetics Service Center builds upgraded models and services the older John Iverson Eagle amps so they are not orphans.
Great power and control from a package that runs cool for its rated output. No longer so well known as Krell, Classe, Bryston, etc. so can be a great value.