Spin,
what sort of ‘touring’ are you after? Day hits?, 1/2 day hits? multi-day? I’m nearby ish (Grenoble) and mainly interested in ski de rando but use the pistes for technique improvements (still a long way to go and most people would think I’m mad to ski away form the pistes with my skills, but I’ve approached it form a mountaineer perspective who is learning to ski rather than the other way.
There’s plenty of Ski de Rando around the Serre Che area, but less so from the resort itself. Domes de Monestier is the one that springs to mind. Otherwise there’s Combeynots etc from the Col du Lauteret, La Grave etc as CFH suggests, both also on the mountains between the Grenoble-Briancon road and the Ailefroide valley or stuff on the other side of the main road around the col du Galibier dropping down to Valloire.
You have deeper into les Ecrins NP form St Christophe, La Bérade, Plevoux, Aileforide then you’re into the realms of Ceillac and then the Queyras etc as you head south form Briancon.
Go to the topos on http://www.skitour.fr.
Otherwise closer to Grenoble you have the Belledonne, the Chartreuse,Taillfer and Maythesine blah blah