Dont play the marshall, white has many antimarshals at his disposal, and what is more, he can easily force a drawish endgame (marshall is nowadays used as a drawing weapon as black! sounds funny but it is true)
Try archangel defense instead, it is very tactical and complex, probably sth you are looking for, u could also play Bc5 instead of Bb7, but then you have to be ready to sacrifice pawn in 1 variation, where white plays c3 and a4 and b5pawn will be lost
I'd estimate myself at 1500-1600 USCF. I recently stumbled across the Gajewski variation of the Ruy Lopez, and I'm excited - it suits my playstyle very well. I've also heard good things about the Marshall, though.
-Can anyone offer thoughts on pros v. cons of the two variations, both in terms of theoretical soundness and practice at my level?
-http://www.amazon.com/Attacking-Spanish-Marshall-Schliemann-Gajewski/dp/1906552177 - worth buying?
-Besides the Schliemann (which I don't like much), are there any other tactical counterattacks for Black in the Ruy that I should investigate?
-Finally, what (if any) options are there for White to deviate from the Chigorin mainline and steer the game into tactical positions?
Thanks!