I got a pair of the Koflach expes super cheap and will use them this winter up on Mt. Washington just to get a good feel for them. I used a pair of degres on Denali last July. They were fine for down at 7,000 but I would probably go with a high altitude liner for the degres if I were going to use them any higher. The problem is that the degres don't fit with the altitude liners very well. I talked with someone who used to work at AMH in Anchorage where they custom fit the Denali liners.
The expes on the other hand will do fine with the stock liners and some overboots for higher up. The one thing I like about the Denali liners are that they are closed-cell foam. I guess that is good and bad. Rather than the liner soaking up some perspiration, your socks will get the brunt of it. Either way that is what your bag is for and like climbabout already said, you and your bag make the best natural dryer up at altitude.
I think you can still find some Koflachs at certain websites who have stockpiled them before they stopped producing them. The Invernos are pretty popular though and seem to be the next best thing to the expes.
"Commitment is doing the thing you said you'd do, long after the mood you said it in has left you." - Bear Grylls' mother