Play 2.a3!  Bezgodov wrote a book on it recently called Challenging the Sicilian with 2.a3.  Hansen wrote a review on ChessCafe giving it four stars.  From the description, it sounds like there a number of original ideas and the lines certainly look tactical.   

But seriously, playing anti-sicilians is ok, but if you're a tactical player you should start learning the Open Sicilian.  You can check out Gallagher and Nunn's Beating the Sicilian 3, although it's a little outdated.  For example, in the Dragon section, many of ideas suggested were new at the time.  In fact I don't the b5-pawn sacrifice against the recommended Qg5 line was even considered, and it's considered the main line nowadays!  Another more reasonable repertoire is Davies' Taming the Sicilians.  The lines are more positional, but no matter what you play, you'll have to learn positional play anyway.  What better place to start than in the open sicilian, where the play is already tactical?

Something to keep mind though, is that the further you progress you will learn that the divisions between positional and tactical play are somewhat blurred, and these labels are often artificial.  Some of the most positionally demanding openings are highly tactical; for example, the Catalan, one of my favorite openings.  Check out some of the gambit lines, if you don't believe me.    Remember there's no easy route to success in chess.

It seems to me that if it is tactics and open positions you are after, then you can't beat 2.Nf3 and 3.d4.  There is a reason this is the main line ...

As Glenn suggests you can try some less theoretical lines - so avoid the English, Keres, Velimirovic and Yugoslav Attacks and instead look at the lines beginning with 6.Be2 or 6.g3.  The tactics will come later on, but they will come ...

The c3 Sicilian is not too untactical, there's plenty of tactical ideas - a lot of the time lines with Nb1-a3(-b5) are quite exciting, e.g.
1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Bc4 Nb6 6.Bb3 d6 7.exd6 Qxd6 8.Na3 is quite an exciting line.
or "similarly"
1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nf6 5.Nf3 Bg4 (there's also some interesting dxc5 ideas in these lines) 6.Be2 e6 7.Na3.