Honestly, I haven't tried anything but what I started with. It may be a bad idea, but I went with assault rifles and have just poured my points into it entirely. When I got into the outer part of the wheel, finally, I realized how much effort maxing one single weapon would take and facepalmed, lol. I want to drop my current toon to try something new, but I just can't pull myself away. The good thing is, the Ap is really rolling in now, so starting a new weapon on the wheel should be pretty easy to get into. Anyway, it's really pretty damn fun.
The thing is, I still mainly use some of the same stuff I unlocked ages ago.
Also, maxing a character in this game seems like it'll be a HUGE investment in time. --- "The key to happiness is disinterest mingled with mild contempt." Better living through apathy. If you're into that sort of thing.