Years ago I got turned away from a couple of the more 'upmarket' places for not having proper shoes on, a few places in Aberdeen can be quite arsey about that but the places you are looking at should be fine. Stay out of the big church looking place (Sin or some shite). Tres expensive.
The Moorings is a good shout but stay out of the Crown and Anchor, just down the road. Was rough as f**k when I went in.
Go into The Grill just to say you have been there. Outstanding selection of whiskeys. 2 Riley's if you fancy some pool or snooker, one big busy one and one quiet one.