An Teallach might be a good option, because scrambly people can stick to the ridge and have good fun, whereas hands-in-the-pockets people can take the by-pass path that is just off the ridge, but you'll all still meet up at various points. Whichever route you choose, it is a wonderful walk. Even the walk in is sensational.
Edited: 30/03/2009 at 12:27