hey andrew11
i think you better be sure about ordering a 7. guerilla make neck thru's, which i'm not too hot on, even tho' i will have them make me a 7 at some point...also you'd be better to try a longer than 25.5" scale, it helps with the low B. something not mentioned in this thread, you might need to re-think your amp and speaker set up, as you'll need to move some air on the low end. to me, the shortcomings of 7 strings is in the player and the speaker technology. i've played lot's of 'guitar stars' guitars, and it never ceases to amaze me just how below average they tend to be. but then again, if they can play these planks and get out of them what they do... respect!
basically, be careful, spend your £ once and wisely. i have a bunch of schecter custom shop 7's to re-home because i have far too many. anyway, good luck
sam
07725634034