Definitly go with the Upper Deck. No question. Much quieter than both the nose and the mid sections, best part is that staffing is generally three up there (two aisle, one galley), providing for excellent service.
Furthermore, if you or your partner happens to have a window seat (not good for viewing, mind you), they make the best "sleeper seats". Recline all the way, stuff a few pillows where the seatback and the cushion come together, and slouch as far as you can, placing your feet and legs on the side storage bins (works best when there's no one in the seat in front!).
If you can, I would try to switch to a -200, as the seat pitch has not been reconfigured on the Upper Deck from the old First Class pitch...70-some inches of pitch for the lucky 12 up there! (oh but wait...NW only puts "the junkers" on their Asian flights...).
Either way, hope you two have a great time!
F L Y 7 7 7 U A L