I've never been an Audi fan, but I found an S4 that has me drooling. My only question is, how bad is it gonna hit me in the wallet when the warranty is up (75k)? The reason I ask is because I'm split between the S4, a 335i, an IS350, and an F250 powerstroke. The F250 and IS350 are covered up to 100k. I know what to expect from the BMW, but the Audi is like a foreign language to me.