PhpBB/SMF/vBulletin...which forum script is best for me !!

Hi
m running a website with 60-80 online users !!
now m thinking to start a MAIN/BIG forum as a *main PART of website*!!

but m confused which forum script is good for me
Phpbb/SMF/vbulletin

_phpBB_: well *i like* interface of phpBB but its has no feature like thanks and rating !!
_SMF_:...