OK, first off, the evo7 is NOT like the evo. Basically I hated everything about the evolution, clinical, sterile, no balls.
However, the 7string pickup is the opposite. It still has the gain, but actually has balls, screams and really cuts through. I hated the evo's in my BSB (they are long gone) and never tried one out, but when i did, i loved it. Plus low notes are bell like and clear. The evo7 is a fantastic pickup.
Blaze is good, but different. I prefer the blaze for recording as it's lower output, but, i have to specify that I raise the 4 (well, 8 technically) bass pole pieces out of the pickup little, and this makes me like the blaze (bridge), before i did that (got a guitar with the pole pieces like that) I really didn't gel with it as a bridge pickup.
Basically either is good
Anyway, Evo7 if you want clear cutting with balls, blaze if you want something a little more rocky and less metal and high output.
The x2n7 is pretty cool as well, as long as you remember to put it 1/2" or so away from the strings to tame it slightly.
Neck wise, I love the Blaze Neck quite a lot, it always has sounded good, but the AN7 is a favorite of many people as well.
If you want a pickup guide to a crapload of 7string pickups, then have a look on www.sevenstring.org
, as they have a pickup review sticky thread in the pickups section.
If you want an easy choice:
Air Norton 7 neck