since you're going the X2N route, have ya checked the D-Activator X?
i'm not a fan of TZ; had it once and traded for an Evo which went to an RG760... the Evo was taken out for an X2N which works fine for Thrashing in Eb. I also have an Evo on a JEM tuned to C and it does the job for solos that slice; for rhythm work, not so much... a D-Sonic works better IMHO.
For singing neck tone... a
Paf Pro should do the job. I have to agree with marky regarding the D-Activator neck - got one for my UV. It's not singy like a Paf Pro but has a "balanced" snap that works well on both high and low notes.
Another suggestion for the neck would be an Air Zone. One of my buddy has one in the neck pos on one of his guitars (Ibanez SC1620) and it's like a ultra-beefier Paf Pro. Kinda like the low-mids of a TZ mixed with MORE of the singy-ness of a Paf Pro..
Reg