Is AWD enough in the snow? Not by a long shot.
Allow me to pontificate: I find the whole snow-tires-vs-AWD debate confusing. In snowy conditions AWD helps you accelerate without excessive slipping, but doesn't help you brake and only marginally helps you turn. These seem like important elements of driving to me!(2thumbs)
I live in mountainous Colorado Springs where it snows regularly, but the snow doesn't hang around for long. Nevertheless, I don't simply assume that my AWD will give me the traction I need - in this regard I'm a firm believer in the effectiveness of snow tires. I've had front-wheel-drive vehicles equipped with snows that pulled away from AWD vehicles left spinning their wheels. Note the number of SUV's in the ditch this winter, led astray by the false confidence afforded them by their AWD or 4WD. The tread pattern and cold-temperature compound of snow tires really make that much of a difference.
So, I stuck a crowbar in my wallet on Monday and shelled out $1,500 for 235/65 18 Bridgestone Blizzak DM-Z3 tires, 18x8 Sport Edition ST3 rims, and a full set of TPMS sensors (I wouldn't be able to deal with the idiot light throughout the winter) from the Tire Rack. Fred from the TR suggested the Z3's over the Z2's and the Pirelli's, and the narrower width won't plow as much snow. Since I have the GT with 20's, it was only $300 more for this package than the 20" snow tires alone! An easy decision considering I'll be able to make the swap when I see fit, and will save on the service fee each time.
Ultimately, the decision came down to the same questions I always ask myself when it comes to buying brakes and tires: would I be able to live with myself if my wife and child had been injured or killed in a crash that might have been prevented if I had not been such a cheap-skate? No. Would I pay the $1,500 to have them back or healthy? Of course. Then pay the man and live in the comfort of knowing you did all you could to keep them, and you, safe.