I'm not sure that Monitor Audio would be a good match with those JBL 4367. The Monitor Audio are very bright and exacting (similar to the KEF in a way). The JBL are a deep horn loaded speaker. I can see how the older B&W DM17 was a pretty good match because it also was a warmer and fuller sounding speaker.
There can be several models of speakers that may sound close to your JBL 4367. One that comes to my mind is the PSB Imagine series. It's a warmer sounding speaker similar to your JBL and the "imagine" series comes in several price levels. I think it will sound more natural and with better resolution than your B&W DM17, but still have that warm/full sound that would match well with the JBL. I'm sure there are other options. I almost put forth the idea of a Klipsch Forte or Heresey speaker, but I suspect those are too large for what you are looking for.
There can be several models of speakers that may sound close to your JBL 4367. One that comes to my mind is the PSB Imagine series. It's a warmer sounding speaker similar to your JBL and the "imagine" series comes in several price levels. I think it will sound more natural and with better resolution than your B&W DM17, but still have that warm/full sound that would match well with the JBL. I'm sure there are other options. I almost put forth the idea of a Klipsch Forte or Heresey speaker, but I suspect those are too large for what you are looking for.