I always believe the sound path should be as shortest as possible. Therefore, no preamp is necessay. What you need are a powerful, high current, clean sounding amp, a well-versed, articulate DAC and a streamer if you desire.
Parasound NC 2250 - $1600; DAC - $900; Streamer - $500
NC 2250 has a sweet, warm sounding and it will pair well with the B&W speakers that tend to be bright. I had its little brother NC2150 and the older model A23. A23 is articulate on top but lack a bit punch on the low end relative to NC2150. NC2150 is more toner balanced with a weighty low end. I think the NC2250 won't disappoint you. $3k is tight on the high end gear and the Parasound NC series is high-end gear without a intimidating factor.