Uncle Sam & The Freedom Fighters Vs The JLA
I think this would be an interesting team matchup. Uncle Sam is arguably around Superman level, Black Condor is an elemental, Miss America got an upgrade and is called, "Miss Cosmos, Phantom Lady can teleport people to black holes, Lightray can keep up with the Flash, Human bomb has serious energy, his finger nail alone is equal to a nuclear bomb, etc...
Let's use the extended lineup of the Freedom Fighters at the end of the second volume. Note: not all the members are in the pic below, I just like this one.