Aqua Di Gio is going to be recognized by many girls as "oh, you smell like my last boyfriend" (no offense anyone...)
Just go to Nordstrom's or Macys and smell around. Scents and all are really evolutionary. Chose what you like and find a girl that likes what you like; I've seen this in action and this is when you get crazy reactions. It's amazing what scents can do.
I'm just a strong believer in getting what you like. I once got something that I just 'sort-of' liked. After a while, it would make me nautious to smell.
My personal favorite is Curve. I also sport Zara, but you can only get it in Europe (sukkas!) I recently smelled one by Armani that I liked. I think it was called Mania.
To be honest though, I'm also a strong believer in 'intimate' relationships with my lovers. My girlfriend honestly gets more excited when she smells my natural armpit or skin's odor than when she smells my cologne (which she's also nuts for), which I feel is a side-effect of the type of relationship were in. Again, it's just an evolutionary chemical thing I guess. Glad I found my place....
Best of luck!
-T
Edit: just checked out the post in ladies lounge and realized that Curve is still going strong! I know it's popular, but I'm yet to meet anyone that can easily recognize it. Interesting.