I'd go with a Rotel RB 991 or RB 1080 but a better preamp than the Rotel. Maybe a Classe or Musical Fidelity. There's plenty to choose from.
Amp Suggestions for B&W 801 Series 2 Speakers
We have a fabulous pair B&W 801 Series 3 speakers that used to be in our HT but now are used for stereo only. We are currently using a Yamaha DSP-1 Receiver and Monster M2 bi-wire cables, but I want to upgrade to either an integrated amp or component amp/pre-amp to see what these 801s can really do. That said, I need to do this for less than $4,000. A local dealer has a used McIntosh 6900 intergrated amp. Another suggested new separate Rotel Pre-Amp & Amp (minimum 200 watts/8 ohm channel). Any suggestions on power requirements, separate or integrated, manufactures and finally, new or used?