In reply to adventure_vulture:
You could get some ideas from this:
http://www.cicerone.co.uk/product/detail.cfm/book/551/title/cycling-in-the-...
The ultimate A-B in the Alps is probably the Route des Alpes, which goes from Geneva to Nice or Menton. It's a brilliant trip, if you want any info PM me, Ms B and I did it credit card style in September.
You could also start in Grenoble, head to Bourg d'Oisans and bag Alp d'Huez, go over the Glandon, Croix de Fer & Mollard to St Jean de Maurienne, take a train to St Michel (the road is not pleasant unless you do it very early in the morning), ride over the Telegraphe and Galibier, on to Briancon, over the Izoard, the Vars and then if you have time over the Bonette down to St Saveur, over to Guillaumes and back to Barcelonette via the Cayolle, then ride out to Gap and get a train back to Grenoble. There are several possible variations to this.
There are myriad other possibilities. More ideas here:
http://www.cycling-challenge.com/
The only other place I'd suggest would be the Pyrenees. Maybe slightly less dramatic in places but quieter, more mellow, better food (imho) and generally better roads though if you are accustomed to UK roads then this not a consideration. The climbs are neither easier nor less magnificent.
Post edited at 18:52