I've watched so many people change forum software's just because it doesn't really work for their site, here's a few pointers. Make sure the CRUCIAL mods you need are available for that software. There's no point not bothering to look because you'll have to spend time converting later. Make sure you know how to use it because you don't want the permissions all wrong because that's a gateway for hackers and spammers. Make sure there is a theme you have ready for it, default themes aren't that big at the moment Make sure you're staff know how to use the software too. Make sure it's still being supported. Yes there's loads of scripts out there but I would rather have a forum on software which is getting updated with new features and security regularly than never. Make sure you try demo's if you choose to buy paid software. Good luck choosing the right software for you!