Nope, never bought a Viper warranty through them. I've bought a 911tt, Cayenne, and X5 warranty through them. I always buy the Maxcare for my Vipers. I guess the Viper is too risky for them to cover? Have you tried Fidelity auto warranties? They are pretty good from what I hear.
Martin - A Maxcare typically runs around $1500, I've bought 3-4 from Mike Robbins at Ringgold Dodge. I think a few others sell it for similar prices, maybe another dealer closer by you will do the same. Worst case, just call Mike and buy it from him. Doesn't matter who you buy the contract from. It's good at any Dodge dealership.