there is so much debates about portals, nobody can answer, because it depend on each needs, each interests... the released portals here are all answering the needs of most users using them...
vBportal is the one that would interest you more, because you were using phpnuke, and vBportal is based on it... but is not free, as the vBportal team offer professional support for guys that are not used to be phpcoders like you...
http://www.vbportal.com/