In reply to SarahA:
How far are you prepared to walk? (and drive)
In the more accessible north west places some quick ideas.
Hayfork Gully, An Teallach, worth it whatever grade you climb especially if you combine it with the traverse.
Tower of Babel, Ben Dearg (Ullapool) reliable in most conditions and Penguin Gully if good ice.
East and West Buttresses, Coire Mhic Fhearchair, Ben Eighe ( a bit more mainstream and less likely to get to yourself)
Jerbil, Coire na Caime Liathach
Post Box Gully and Raeburns Superdirect (haven't personal experience of that), Sgurr Ruadh
Diamond Fire, Beinn Alligin
White Rabbits, Cul Mor
And several hundred others
Don't forget that there are a lot of relatively unvisited places in the central Highlands, for which, if you have the SMC Ben Nevis guide you already have descriptions. For instance Meall Garbh has a 4* IV,4 and is a beautiful place which is a lot easier to get to than you might think if you have a bike (Ben Alder too).
The Cairngorms are overflowing with obscure crags some with remarkably good routes.