That's a delicious new ride.
Regardless of the jammer chosen, I'd definitely consider VEIL and LaserShield for specific point-defense.
And on that front, since the looks of the vehicle is top-priority, consider contracting a professional body-shop to do the VEIL'ing. Search for the membername djrams80
on RadarDetector.net, and cross that with the search term "professional," you should come back with a hit on his "VEIL professionally applied" thread, in which he shows pictures of his Mustang's lights, which were prepared by his favorite body-shop, using their HVLP paint-gun.
This should not cost you much, particularly if your bumper skin is coming off, anyway, for the detector/jammer install.
Overall, if you were sticking with the SR-series RADAR antenna, I'd just go ahead and figure this on a money-saving basis, and get the ZR3.
If you're going to opt to replace the entire unit, then it's a no brainer, just get the ZR4, which is packaged with the 9500ci.
Ultimately, you'll need to ask yourself what's more worth it to you - the seamless integration of the ZR3/4 to your current Escort system or updating your SR-series to the 9500ci, or, alternatively, switching to a different detector system altogether, and seek perhaps better protection, but without the same level of integration.
If you are going to stick with LED-based jammers, a Blinder 3- or 4-head unit will likely provide more jamming performance, as compared to the two heads of the ZR3/4 - but definitely, it will be more work to co-locate the systems' alert displays, and there will not be the same level of integration.