Dear NUS student:
If you desire "higher" standards from your bf, suggest you start the ball rolling yourself. Try treating him to a more classy joint on his birthday just to show your "standard". See if he reciprocates.
The above is only a suggestion if you wish to play this game, otherwise I'd say Sushi Teh (or any other airconditioned restaurant) is an appropriate choice, I don't see anything wrong with that.
Cheers!