Forum software is not the best, considering the latest leak for SMF 1.1.13 was pronounced on the web (Meaning if people know how to, they can access your account tables and see your password hash - decrypting it)
I suggest either Vbulletin (Costs money but every dollar is worthit). Kinda hard to install plugins, but with some experience, I'm sure you'll learn. If you need help coding plugins or implementing, feel free to turn to me. (ex-vbulletin plugin coder and template designer.)
MYBB - Extremely easy to use, great layout and mechanics to it! Worth a look.
FluxBB - Small boards, unknown to almost everyone but a good structure for mobiles + browsers.
I have a legit Vbulletin license I wouldn't mind distributing to you, since I don't use it anymore. A few months are left on it.