I have a recommendation, if I may. I didn't see this one mentioned or on the list.
"The Interwarp Experiment" is simply amazing. The story was great, the level layout was excellent (not too big, no issues with stuck BOffs). He provides some great role play options and backgrounds. And it had that "Star Trek Episode" feel to it.
With no insult meant to any of the other wonderful missions already on this list, this is the best Foundry mission I've played.