Most aggressive response to 1 d4?

For a long time I had a great life with the Slavic defense.
But the series of defeats in the low-popular openings, like Colle, London and White Stoneval - forced me to look for something more radical.

Now I am preparing 1...c5 for my opponents.

I do not claim that it is a reliable system.
But the players of U2000 are often confused at the board, because they have to think for themselves, rather than crawling ten standart moves. So, I think this is what I was looking for!

Just a small example of how to confuse an experienced d4-wolf.

Highly-respected @BL4D3RUNN3R said the Smith-Morra gambit, but if you made the d4-player (often a Londoner or Colle fan) play the Sicilian gambit, Damn !, you are already on the right way, I think.

This particular line...Schmidt Benoni I think, take a look at Sevian - McShane from the current World Team Championship Round 3 from the other day.

Very entertaining...McShane clearly understands chess better than Sevian. It ended in a draw (and don't pay attention to engine evals on this one) but any true chess player would be impressed by Blacks play.