I regularly visit Troup Head for the Gannets and think its great and very quiet (human wise). There are 3 main areas I like to go. When you come through the gate at the cliffs if you go straight on there is a bank which the younger birds use and are quite close then as you move round to the left there is the main viewing area and then follow the path further and at the very end of the reserve you can get good shots of some of the gannets higher on the cliff.
If you're interested I can send you google maps screenshots of where I mean. EDIT: - just realised I'm probably too late but offer is still there.
Neil