If you want the Paradas better plan on waiting. I called Discount tire, Tire rack, Mr. Tire, various local Shops, and Yokohama and it seems there is a national backorder. They still have many unfilled orders. Since I am currently running on a donut I do not have that luxury so I went with the Pirelli Scorpion STR. I know it is not a good for grip as the Parada, but at this point bannana peels would be better than the Droolers.
Discount tire sell the scorpions for $123 whereas Mr. Tire is $186. Tires will be here Monday and the total damage was $533 w/ road hazzard and there is a $40 mail-in rebate as well. Install w/ alignment will run $120. $533+$120-$40 = $613 not bad IMO.
I'd get snow tires for those conditions, too. Then you shouldn't need chains.
From reading the other posts, the Paradas are good for mild intermittent snow and ice, not full blown winter in the upper states.
Why are you asking if you already have a snow tire set? You sound like you're all ready for winter.
The manual only recommends not putting chains on the 20" due to clearance. 18's should be fine. One more reason I had no desire to get a GT.
I haven't actually bought the set yet, just running through my options. Sounds like I'll probably go for the Blizzaks. There are times here where chains are required to go over the passes, even with traction tires, so I have to be able to put chains on them. Anyone know if the stock 18's can have chains put on them? If i get the same size tire as the stock wheel on the touring, can I put chains on them???