I'd go for the opposite route Sron Garbh and Twistin Hill to An Caisteal then via the bealach to Bienn a Chroin. It's a bit of a pull up the first bit, and one or two wee but enjoyable scrambles. I recently had perfect weather and visibility, all the way up over Glencoe to Ben Nevis. The walk out following the River Falloch is long and boggy in parts though.
(Written by: Iain McRobbie)