I've been seriously contemplating getting Klim gear, and thought I'd go full insulation for bibs and jacket. I've been sick of having wet/cold pants after hitting through fresh powder and wanted the "guaranteed to keep you dry" stuff.
I got a free pair of Klim Extreme bibs, which are not insulated, as my dad sold his sled and didn't need them. I'm hooked on 'em. I had a layered system that consisted of polyester/wool long underwear, then a pair of polyester sweat pants I got for 8 bucks at Dunhams, then the bibs. I have a castle insulated jacket and layered under it as well. Rode 500 miles last weekend with highs in the low teens, a lot of riding in below zero weather, was warm as toast. This included standing for a few miles outside watching the i500 race.
Now I have to decide whether to buy an uninsulated Klim jacket.....