Amp upgrade suggestions for a $2K budget

Any of the Cayin products, used. They are great values and sound terrific. Go with a 100.

Don't get rid of your speakers. I have your speakers and was running a brand new Rotel RB-1582 and RC-1580 amp/pre. The soundstage was no where to be found. I tried all different tweaks. I thought it must be the speakers so I connected my old DM-602's and found out it was the Rotel gear that was giving me problems. I had run the Rotel stuff in for three months and the sound never changed. On a whim, I sold it off and bought a Rogue Cronus Magnum for just under $2k. Man what a difference that made. I didn't even recognize my speakers, no lie. I want from shrieking unlistenable music to a giant sound stage of loveliness. The Cronus Magnum works really well with the CM7's. There's another guy on this forum to with the Cronus Magnum and CM7's and he really likes his set up too. You'd be surprised. Rogue has excellent customer service. They're made in Pennsylvania and you can speak to the owner directly any time you have a question.

P.S. - I kept the Rotel RCD-1520 CDP and it's great.

Classe' is often mated with B&W's.

I second the Classe suggestion for SS equipment. If you can make due with 150 watts/ch try the CAP151 integrated(around $1000 used).