I reviewed all three special dining events in my trip report. I think the event I'd recommend for you would be Party for the Senses. It's been a regular staple of the festival, held every Saturday night with a rotating lineup of chefs and dishes from around the Walt Disney World Resort and around the country.
The event is held at the World Showplace (formerly known as the Millennium Village), and it's set up kiosk style with stations with tasting sizes of foods and tasting pours of wines. It was $135 per person plus tax, and well worth it.
AllEarsNet has a description of the various events from last year, along with reviews of some of them, as well. It should give you an idea what to expect if you plan to book these events.
But, as the booking date in the summer draws closer, the phone lines will be jammed at 7am eastern with folks trying to book events with limited availability. Some events are sold out within 10 minutes of the phone lines being open. Party for the Senses is a larger event, and doesn't sell out that quickly, so I suggested that first.