Welcome aboard! I would be neglect if I didn't mention that one of your best "first moves" is to join an active VCA chapter. You lucked out, in that the Kansas City Region is one of the most active in the country. Oh yeah, and free Dyno Day (with food provided too), free Viper Calendar, and the knowledge of 50+ local Viper owners are at your disposal. Off the soapbox, here are your suggestions:
1. For regular Viper service, Bud Brown Dodge on Metcalf (Overland Park) is excellent. If you are out in the eastern metro, try Jay Wolfe Dodge in Lee's Summit. Up north, Gladstone Dodge in Gladstone has a good reputation for working on Vipers, although I have heard they sit outside when not being worked on (even over freezing rain weekends). And while I think the world of some of these dealerships (Bud Brown in particular), I personally buy 5-quart jugs of Mobil 1 at WalMart and get the oil changed at the local Quick Lube - they will usually do it for me for free when I bring my own suppplies (oil & filter). Figure a dealership will charge between $80 & $110 for an oil change on a Viper. Do it yourself for around $55 using Mobil 1. Oh, and one of the best dealerships for Vipers is (gulp) a Ford dealership: Mike Anderson at Chuck Anderson Ford in Excelsior Springs usually has 3-4 Vipers in for service on any given day. While he can't do Dodge warranty work, he does everything else on Vipers - from supercharging to paint work to complete custom engine builds. And he is also a Kansas City VCA member and one heck of a good guy to boot.
2. Pilot Sports are excellent tires and would be my first choice on 1999 - 2004 Vipers. However, Kumho makes a 17" tire for earlier Vipers that many seem to think offers better traction, albeit shorter life. They are a stickier compound and apparently cost less than the Pilot's as well. I desperately wanted them for my 2000 GTS, but they were (are?) not available in 18". If you are looking for longer life with a little less hook-up, Pilots are the way to go. I got 20,000 miles out of my first set, including many passes at the dragstrip, some autocrosses, and a few road course events.
3. If you are going to a Dodge dealership for your service, have them check over the car and look up the service history based on the VIN. This will alert you to any potential "problem areas" that car may have had in the past. With only 12,000 miles, I would do an oil change and see how it runs otherwise. I don't know that plugs and wires are a big deal with such low mileage, but the guys above have more technical expertise than I can claim. If the car still has the stock tubes and filters, I would replace them both with smooth tubes and K&N's immediately - especially if they have the original stock filters after 12,000 miles.
Again, welcome to the Viper Nation - you chose wisely!
Chris