One of the "big ones" - the Col de l'Iseran is 2769m. If your bike's not running touch rich at the bottom, it sure as hell will be when you're at the top ;-) . Fill up in Bourg if you're getting low on fuel. From here to Val d'Isére is fairly busy with resort traffic, but really good until just before Val d'Isére where the road is too busy to be fun. Watch out for the unlit tunnels with bends in them just before Val d'Isére.
However, once through the town, the road changes into a high-alpine playground. After casino online a straight-ish bit the road turns sharp right over a small bridge then it's up, up, up. A great surface and a steepish climb to the pass heights - watch out: no crash-barriers! There is snow at the top (and skiing) all year round and often on the roadside until early July.
While the northern ramp is steep and relatively short, the southern side is longer and less steep, generally much greener and faster. I'm really not sure which way I prefer doing this, but I think from the south, the longer gentler climb makes braking easier and you can get up some pretty good speeds. The scenery is much more dramatic as well, with some great views on the glaciers on the mountains to the south. More-or-less a ride through a valley floor until Bonneval-sur-Arc, the road then climbs up the mountain. This bit is less well surfaced and a bit bumpier than the northern side.