given your system, I will suggest Cary SLP-05. I have heard Cary in dealer show room only, but my impression, like most, was very positive and found Cary to be musical and warm. I had ARC Ref 3 in my system for a short while, also heard it in several friends' systems. It's neutral but also casts its own sound. do a search on this forum to find out what are the negative comments of Ref3.
Both Spectron and B&W are on the leaner side of sound, Cary should complement the system well. if you don't mind not having XLR, try Conrad Johnson as well. I also like SF Line 3SE.