What portal program would you recommend for SMF? or is there an available mod?
Currently there is only 1 offical SMF portal, which is in its beta stages, read more about it here:
http://www.simplemachines.org/community/index.php?topic=11318.0
But you can use other CMS's with SMF such as Mambo Open Source, but I personally suggest waiting untill they release the official porta.