We use for our company portals the dslocalizator in combination with mmlinks. This way we have can easy add text in multi language. For the special modules like you can place one module for each language (and only show the for that language).
This way you can make you portal multi language with every module. The other module's like Apollo and Effority can't do this (if i'm right).
Also we've change dnn. Now we can add the multi language information when creating a tab (workes great).
And best of all its free :)