Springfield, Sig, Glock, S&W, Taurus, H&K, Ruger, CZ, Kimber, just to name a few, are all great makers. Ask 10 different people which is the best and you'll get 10 different answers. Each maker has their own little differences, so you need to research them and decide what features you like and which you don't. This could take a while. Try renting different guns at a range.
Also, realize that once you settle on one and buy it, you'll want another one in about 2 weeks.:biggrin:
OH, and yes. Very cool girlfriend you have!