phpbb = forum software
smf = better forum software
Vbulletin = same as smf, but not free
the best forum i know to make it 100% adapted to your needs would be SMF, it's really easy to use, at first there are alot of settings to do, but when those are done everything is as simple as it gets
updates are way to easy, mods /skins are uploaded / installed by smf itself whenever you want to. (skins you have to show the path to it first)