The JBLs of yesteryear were true gems.
Short of my Rectilinear 3s, my JBL 4312s Studio Monitors were as good as it gets. But this was an audio system with Home Theater not even on the horizon. Ooops, I am showing my age here.

But these along with JBL L Series are a thing of he past.
Although they were largely responsible for the evolution of the standards that now exists, they lack the dynamics for Home Theater applications and one will definitely find it a challenge selecting a center channel speaker with matching Sonic Signature in today's speaker market. The bar has been set too high.

As Greg mentioned, the trick today is a compromise. The ability of the speaker system to maintain the sonic integrity required for great audio performance while catering to the Home Theater enthusiast.
Matching the Sonic Signature is the key here as you want to maintain equality in tonal balance as the effects transition from left to right, front to back.

This does not necessarily mean that all the speakers should be from the same manufacturer. Ideally, this would be the preference, but quality center channel and rear speakers are usually a bit expensive if thay are to maintain the standards effected by the main or front channel speakers, especially if the front speakers are large. And if Home Theater applicability is not critical then the OP would have the flexibility to devote more resources where it is preferred. Hence, my non-recommendation for speaker packages.