Tony,
Grenoble is only just over an hour drive from Alpe D'Huez. I have managed cheap weekends there a few times. I phoned the
Alpe d'Huez tourist office (0033476114444) and managed to get a basic 2 bed appartment in the town 100 yards from the ski lift for 65 euros a night between 3 blokes. The have a good selection to suit your budget.
There is a bus from the airport but we hired a car (carhire3000.com) for 30 euros a day.
All in we got 3 days accomodation plus flights and car hire for less than 200 euros each. Bargin :D
Mountain is good too, would not be as challenging as St Anton but there is some great views from the top of the glaicers and the tunnel is a great run (my profile picture was taken halfway down the tunnel).
I know your not fond of French skiing but for a cheap snow fix it does the job :)