I kind of went through this (and am still going through this), trying to find the right neck pickup. In my case, I'm pretty set on the Holydiver bridge, and am currently using the Emerald Neck with it. However if you're looking for a brighter neck pickup as I was initially, I would suggest the Holydiver neck as very bright with excellent clarity and note separation. It handles gain nicely as well, but to my ears was slightly "sterile" and didn't do the throaty/bluesy thing at all. If you don't care about that, you might love it.
The True Grit neck was fairly similar, though more throaty and not quite as bright. It might work for you as well.
It might be poor form on the BKP forums to recommend other brands, but I think that my personal favorite boutique neck pickup is the Suhr SSV. It seems to have the best qualities of many pickups. It's fairly bright and has great note separation like a Holydiver, but can still sound very throaty and bluesy to me. At least, it's perfect in my Suhr Modern, but different guitars need pickups, etc, etc.