in addition to the Imaginext lines, FIsher Price also has a Hero World line that has both DC Super Friends as well as more generic everyday "heroes" (army, police, firefighters, etc.)
They are closer to a 5" scale and the line has recently been revamped and re-introduced with Voice-Comm technology. Basically when you put the figures together, or into a vehicle with Voice-Comm tech, they will interact and have "conversations".
Solidly built, interesting aesthetic, and great for bashing around the living room.
I'd recommend those. Especially if starting now with a new line and no concern for tracking down the harder to find figures from version 1 without Voice Comm (I'm looking at you Atrocitus, Sinestro, and Hawkman