I like them on all 4. I use to put them on just the drive wheels but when your front tires turn into snow balls it's hard to stop and turn.

Can't go wrong with Nokian tires.

Depending on where in new England you are, my local tire guy always has great deals on Nokian tires. I've bought several sets now for different cars and will be buying another set for my wife's van.

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Live on Cape Cod, just put snows on all four wheels. Got some rims from the salvage yard at $50.00/per, had them sand blasted to bare metal, put three coats of rustoleum etching primer on, one coat etching, two coats regular, sanded them down, painted them dark charcoal grey, three coats again, three coats of clear coat, then got chrome center caps and lugs. They look better than my summer wheels, so those will be treated next. Snows are a bit noisier, but they sure do grab better in the snow and ice. Nokias!

 

I picked up a set of Cooper Discoverer M+S with studs last winter and never had any problems or close calls.

As far as placement, definitely all 4 if you can afford it. If not, put the snow tires on the front. It is far more important to be able to stop and turn in snow/ice than to go. If you don't have enough traction to start moving, well, you just sit there and wait for help. If you don't have enough traction to stop or turn when you need to, you can end up with a broken truck or body.

 

If you put them on all four you will be able to rotate them and keep the wear pattern even on all. That way you can get more miles out of them.