Okay, I'm doing an approach based on your budget as well as my own preference. I am not one who likes room correction systems, so my approach is fully based on sound quality alone. First, I would look at picking up a Marantz AV7703 or AV7704 HT processor. These are just the recent generations. They will only be less then a couple years old and they will also support 4K and many of the newer features. The reason I recommend this is that the Marantz processors (as well as the upper end receivers), are the only items at this price level that have fully discrete analog output circuits (instead of op amps like everybody else). They are excellent sound quality, but are on the warm sounding side, so I would also recommend upgrading the internal fuse to something like Hi-Fi Tuning "Supreme" or "Silverstar" fuses. These are silver fuses and will increase the high frequency resolution. You may also find that you need to upgrade the power cord to have something like silver-plated plug/IEC connectors or even silver plated copper wiring (I generally don't advise silver, but in this case I think you will need it). The AV7703 and AV7704 can be easily found on ebay between the $700 and $1200 range.
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This leaves a great portion of your budget for amplification. The B&W really need a high resolution amp with lots of current. There is a Krell S-1500 on audiogon for $2800 that would be an excellent candidate. There is a Classe Sigma Amp5 for $3000 that could be another good choice. I would avoid warm sounding amps like McIntosh, Adcom, B&K, Acurus, etc. If you can find a used Emotiva XPR-5 or even XPA-5, those would work great.
