The most aggressive reply to d4

@Dr_King_Schultz "If you also want to make sure you get an open position, with tactical themes likely occuring early on, you should probably play the Grünfeld or the Tarrasch. If you also care about the theoretical reputation of the opening you're playing, go for the Grünfeld. ;)"

Siegbert does not approve. :(

Dutch. I play the Stonewall, and if you work around your pawns you can get some nice strategic attacks. It isn't passive, it is solid.