In reply to Skol:
If you are wanting to stay in there overnight, Shenaval is probably the best bet (unless you want to carry a tent or bivvi kit, in which case you can do the round from Corrie Hallie and spend the night part way round).
I'm not sure why it would take three days, though, rather than two - head in in the evening (it's light very late, and it it's an easy walk in), do the round the next day, and head out the next morning. Unless that's what you meant by three days!
Another option is to do two big days separately, without staying in there overnight - A'Mhaigdean and Ruadh Stac Mhor from Poolewe (a long, scenic walk, but not a particularly hard day), and then the other three/four from Corrie Hallie, with or without a stay at Shenavall. This is the way I've visited those hills.
If you do manage to have more time and are staying at Shenavall, Beinn Dearg Mhor is a particularly fine hill (and easily combined with Beinn Dearg Bheag).