Nobles-Charlotte South Park
I had a really good meal there about a year ago. It's pretty pricey but the food and service reflect that. I'd definitely recommend it for a "romantic" meal.
That said, I tend to avoid nice resturants on Valentine's Day because they often have set menus and I like to choose my own food. Plus, I think quality can suffer when dinners are "mass produced" for two full-house seatings.