Yep, avoid Easter and you should be fine (though last year the snow was disappearing faster than usual, this year there's been alot more snow in general - specially in the northern alps).  The classic haute route is a great route but there are plenty of lesser know and just as good ski tours in the alps... there are also plenty of ways to vary the routes to take in peaks or get away from the crowds a bit along the way.  There's a book called Alpine Ski Mountaineering by Bill o'Connor that has all the classic tours in it (there are two volumes - east & west alps I think).