I've been using CH6 all season and I'm out of basically everything else. The temp range on that wax seems to work really well for MN skiing. I need to buy some CH8 before our trip though. The CH6 I've been using is too hard for the conditions were going to be skiing.
Forget the CH8, get the newer UR8. It seems to work over a much wider range, particularly at the lower temp end. Getting like holmenkol beta in terms of versatility