Awesome monitor... I am jealous!
Take her on a picnic. I am guessing but I would be willing to bet that she would consider that to be a really awesome gift. Get some wine, cheese, pastrami, good stuff. A basket, a nice blanket or ground cloth and head up to the Bryce Canyon or Pink Coral Sand Dunes State Park (both are incredible), or Lake Mead for a day trip. Then again you guys might like Ventura better, there are SO many great places to visit near you.
She is in love with you and time with you will be the best gift you can give her. Wimmen are a mystery but only when you don't realize that they are nothing like guys, trust me on this.
The best gifts for your girl don't cost a thing.