You can see how much a warranty will cost at http://www.lexus.com/models/warranty_vehic...tion/index.html
I am waiting for my Lexus to arrive, but I currently have a BMW. I bought my extended warranty on my BMW (after market) for $2,000 and I bet the warranty company has paid out at least $7,000 towards my car. It was a LIFE-SAVER! If you ever decide to sell the car, you can either transfer the warranty or get a portion of the initial investment back. I plan on buying one when my Lexus arrives!
Ryan.