In reply to DaveHK:
Not been in a van, but have been many times.
Haggis Trap is correct about the Thurner books, both of which are good.
Nearby valleys have lots of options - the valley (forgotten name) near Lech, which has Warth & Schroecken resorts, has some great touring (I have a german language magazine supplement which has various day tours, PM if you want a scan). Also, you're not far from Silvretta - maybe 90minutes drive from St A to Ischgl which has some good touring & lift-assisted fun. If the weather closes in around Arlberg, then there's loads of lower altitude day tours around the Innsbruck area which again is not far on the autobahn.
Landeck could be a good option for van camping if St A is poor. And Landeck means you're closer to other options such as Ischgl and further down the Inntal.
The Rother skitourenfuhrer books are also useful:
http://www.rother.de/index_k_avf.htm All in German, but useful maps and summaries which should be OK even if you don't speak much of the language.
have a great trip. I'm a huge fan of that area of the Alps. if you're lucky with the powder, you'll be smiling for months
Rod