At Deer Valley, look at either Goldener Hirsch or Glitretind at Stein Eriksen Lodge, both in Silver Lake Village. You can also add Mariposa as another option there. Any of them would give you intimate, romantic atmosphere and amazing food. Of the three, our personal favorite would be Goldener Hirsch.
If you want to venture down to Main Street, Talisker on Main or Silver are two recent additions that are popular.
I'll throw in one other opportunity. While it might not be an intimate, romantic setting, Deer Valley's Fireside Dining at Empire Lodge is an amazing value and a truly unique experience. It's buffet service with food served at four fireside locations. It's a real value at $58/person. You can combine it with a pre-dinner sleigh ride. If you want to go that route, make a reservation (now would be good) and ask for a nice table in the back fireplace room. They only seat a couple tables there and it's quite intimate and much better than being in the main room or upstairs (which is not a good place to be).