Hi, Elizabeth! Well, to begin with, he will already have the ultimate experience, because he'll be there with you! In order to stick within your budget, I would probably plan to splurge on one really nice dining experience - like the California Grill at the Contemporary Resort. If you time things right, you may be able to enjoy the Wishes Fireworks display from the restaurant! Or if he's a guy that would be up for a little fun, you could do a character meal at Chef Mickey's or the Garden Grill at EPCOT. The other meals you can do at counter service locations, but choose fun ones like Cosmic Rays or Pizza Planet. And save room for the ultimate in Disney dining - either a Mickey ice cream bar or a DoleWhip.
There are special gifts and celebrations that would fit any budget available at Walt Disney World, and you can find more information about them
HERE . You'll find everything there from welcome gifts at your resort to the Sweetheart Dinner for two.
Make sure you try to catch Illuminations at EPCOT and Fantasmic at Disney's Hollywood Studios. Both are incredible to watch, and ultimate Disney experiences. Another great Disney experience is the brand new Move It! Shake It! Celebrate It! parade at the Magic Kingdom
Have an absolutely magical vacation, Elizabeth! And thank you for your question!