My recommendation, Prostheta, especially since you're in the UK, is to grab some Bareknuckle passive 8s. They just started offering them in all of their humbucker models. An 8-string Nailbomb would be awesome.
Anther note: if you post this (and your other 8-string) in sevenstring.org's "Extended Range Guitar" forum, you'll probably get a pretty damn good response there too!