Chuck, we use 5 spoke Forgeline wheels on both of our cars - 17 x 11 front and 17 x 12.5 rear. They are light, strong, easy to keep clean, and help with brake cooling. I highly recommend them. We got ours from Keith Moody at bobby Archer Motorsports....
We use Michelin MXX3's. In front we use 315/35 x 17's and stock size rears. This has proven to be a good combination for Viper Days events - several of the quickest Super Stock class drivers run this set up. As Alan mentioned the MXX3's are hard to find - particularly the 315's for the front. We have a supply that will hopefully last for this season - if I don't keep flat spotting them!!!
18's vs 17's is a tough choice. In theory the 18's woiuld be better (and do allow larger brakes) but the Viper seems to like the extra sidewall compliance that comes from the 17 in the rear.
I hope that this helps!!!