Why have you ruled out the other possibilities. Clearly, you are a positional player, a lot like myself.
I'd say go for the most positional defense to 1.e4. The Caro-Kann!
I think my friend sums my playing style up the best: you play safe openings but in your core you are an attacking player =)
If your chess philosophy as black is to bore your opponent to death, then yes the Caro is a fine choice!
Mine is more of a equalize / stablize and then counter attack