In reply to Anhibian:
For solitude I'd recommend Cresta, for exposure No.3 Gully Buttress (both Ben Nevis), and for a mix of the two Centre Post (Creag Meagaidh). All IIIs and none of them easy in poor conditions or bad weather.
At II, I'd have to go for Ledge Route (the only 4 star II on the Ben), but only on a clear day when the views are spectacular.