In reply to LakesWinter:
Although it's over ten years since I was last there, I climbed a fair bit in the area, as a good mate had an apartment up at Puy St Vincent. If you do head for Rocher Baron, I'd recommend scrambling round to sector 1, the West Face. It should be quieter than the area nearest the car park, which can get busy, and the views are excellent. Short routes, easily doable on a 50. Just across the valley is a less-visited but very pleasant crag, Casse De Prelles. Once again, you'll be fine with a 50. If you do invest in a longer rope, I'd recommend a visit to Les Ayes. It's a very nice venue, set above a stream, but you need a 60. All these are close to Briancon.
You mention focussing on multi-pitch. If you mean bolted, I assume you've got the mighty Le Ponteil on your list. Plenty of strong lines and dramatic situations. Le clos tramouillon (6a+) is an excellent 9 pitch route that finishes up on the summit.
Finally, for easier days don't forget the area boasts some superb via ferratas.
Post edited at 08:12