In reply to Oscar Dodd:
Hutchison Hut is handy for Creagan a' Choire Etchachan, lots of good routes in your grade range but not the easiest place to get to without a car.
Once you're outside the shooting season Carnmore is an obvious choice, buses to Poolewe.
More esoterically there's Backhill of Bush in Galloway, with VS - HVS routes on Dungeon Hill pretty close. Would need some hitching.