I have a 4, which I like, I just find that I need those 5 extra notes. I have a 5 now which is sweet, but i've been looking into 6's. I think they're kinda cool, but what's the point to it other than going a lot higher? Do you find it very useful? Also, I don't like the gargantuan sized necks, is it possible to get a thinner like neck? I'm sorry for all these newb questions.