In reply to Matt Adey: You'll probably find yourself climbing around those grades in your boots and crampons while wearing gloves, particularly on more mixed type routes with snow and rock sections.
on easier routes with snow and glacial approaches and longer rock sections ( Voie normale on the dent du geant springs to mind). you'd take your crampons off and climb the rock in big boots, around Severe I guess,
if you're confident on that kind of ground then you'll be fine in the alps, While training for the alps last year we were moving together on routes up to around MVS in big boots and then repeating routes we'd done in rocks shoes up to E1 in boots, I found that was a great confidence booster.
HTH, Pete.