I spouted at some length about this in a recent post on this board but the summit of Beinn a' Chrulaiste is a superb place to be. It's just a walk all the way, up occasionally steep grassy slopes. As well as offering utterly superb views all round, it's also the best viewpoint for Glencoe's star attraction, Buichaille Etive Mor. Chrulaiste isn't properly "in" Glencoe, it sort of sits sentinel at the eastern end. Walkhighlands has a route description, and I wrote about it in a recent thread which I think had the mountain's name in the title.
Buichaille Etive Beag is the only other mountain I've climbed in the area, and can vouch for Sparnel's claims. It's a cracker.