Your speakers have an 84db efficiency at 8 ohms - not the most sensitive speakers, but most BW's sound better with more power. That being said, the PM1's are rated at 100w max (a range of 30w to 100w).
The ARC Ref75 would be an excellent match, as would the Cary. Everything else is going to give you way more power than you need or that the speakers can handle. The monoblocks will be difficult to find under $8K.
The ARC Ref75 would be an excellent match, as would the Cary. Everything else is going to give you way more power than you need or that the speakers can handle. The monoblocks will be difficult to find under $8K.