I may as well take this moment to share my favorite opening: The Grunfeld defense. It's really fun to play.
The Sicilian (Dragon Var.) is too tactical for my taste, but you may enjoy that as well.
As white, I'm a huge fan of most things resulting from d4, but especially look at queen's gambit, anti-nimzo-indian and catalan.
If all of those are too in-depth, the others have suggested some great ones: The Scotch, many gambits and some lines involving knight move as the first move (Reti and KID particularly).
+1 for the Catalan
I wouldn't use 1. Nh3 as anything other than novelty, but it may throw someone off.
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