You can read to the bottom if you want, but if you're in the market for some insulated pants BUY THESE NOW! On sale for $69.99 you won't find a better deal on a really great pair of pants.
Eddie Bauer's Powder Search Pants have a great look and fit, are waterproof and highly breathable, feature crampon patches and belt loops, and just wear wonderfully. Two zipped handwarmer pockets and a zipped thigh pocket are the perfect amount of carry space, and inside the bottom cuffs are built-in powder gaiters. There's even a little D-ring for your powder pass.
I've been wearing them in below zero temps over boxer shorts and they are the warm fuzzy bomb. I haven't had any problems with overheating, but if I did I'd just unzip the inner thigh vents and bam! Bob's your uncle. The only thing I'd change is to add some suspender loops and an extra snap to the gaiters so they'd cinch tighter around smaller non-ski boots, but don't let that stop you.