damameke, have a look at my discussion of studded tires (
Studded tires: treadwear, advice, warnings? ). We discuss the WR and WRG2, as well as the Hakkapeliitta 5 (which is studded). I was sold on the non-studded WR by Jeddak, a driver from Alaska. Going to buy them shortly, once I get some steelies.
I, personally,
couldn't care less how much "perceived pattern noise" there is from the tire. I never drive my car with my stereo off, and that's the only way I ever hear the tires anyway

However, I am going to slap on some Nitto NT555s for the summer; so in the heat, with the windows down, the sound might annoy you in the end, but it's something I can safely ignore.
EDIT: Noticing that I didn't answer your question about wheel size: I'm not yet sure. My stock wheels are 16", but I don't really want the added tire thickness of going down to 15" rims. We'll see, I guess!