In reply to Subseaclimber:
Petits charmoz is great as a rock route. It's easy climbing which means you can focus on the approach, route finding and descent which IMO are the most challenging parts of it.
A good mixed route would be the pointe lachenal traverse. Again easy climbing, but this enables you to work on your moving together skills and rope work. The forbes is also a good idea, but a lot bigger and more committing.
The chere will most likely be in, but the conditions can vary massively on it. When I did it last summer it felt about scottish IV 5.
I think a big mistake when you start off is taking the alpine grades too literally. The problem is that the PD, AD, D, TD, ED grades are very much overall grades and can sometimes be misleading. The better way to judge difficulty is to look at the length, commitment grade and technical grade as this gives you a much better understanding of the route. For example, a lot of people I met last year did the North west integrale on the petits charmoz (AD) and then decided they might try the whymper couloir (AD+). Seems like a logical progression. But while the integrale has a 10min approach, commitment grade of II, is 300m long, and has an easy one abseil descent, the whymper has a 1 day approach, commitment grade of III, 700m long and a fully involved descent back down the whole route. To top this off, the whymper has to be started at 1am (not taking into account of approach time) so that you can get back down the couloir before it becomes a death trap.
Basically, you're probably best off gradually easing yourself in so that you can get used to the alpine feel. Also, you'll find it really useful to be open minded about which routes you do. Getting hung up on dream routes can be incredibly frustrating, and there is a lot to do out there!
Hope that helps to some degree