The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I'll have to go with Freedom City too. I liked it so much I created the WSAR Newscasts for use with it (you can download the mp3's at the downloads page of Valdier's Site - plug, plug ).
Well, I agree with what others here have said, but once you get Freedom City (and maybe Crooks), check out The Algernon Files by BlackWyrm Games. It's a great source for heroes and villains of all sorts.
I'd have to go with Freedom City, too. Greatest M&M supplement out there. Crooks! is good, too, but I don't like most of the art (Ramón Perez should have handled ALL of the art on that one).