I say why ask us? Ask her! Take her shopping or is your girlfriend the only woman in the world who doesn't enjoy that particular pastime?
I once took the sexist approach of trying to determine which handgun my wife should look at. Here I was discussing .38s, .380s, single stack nines, even a Beretta Jetfire with the fellas at the store. Big mistake. She was never going to buy a pistol she hadn't shot herself. That is always great advice, but I had forgotten it cause I was the exxxpurt!
My wife and I went to the range, rented some pistols, and now this five foot two, 110 lb woman packs a stainless Colt Officer's model because she thinks the big bore is intimidating to the bad guys and fun to shoot as the trigger pull is always single action. Go figure.
Take your gal shopping and let her pick. Don't criticize, but be helpful nonetheless. When the choice is made go, "one for you, and now one for me."
That night should go pretty well.
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Real artists ship--Steve Jobs