I just bought an '07 GS350 and have less than 300 miles. I want to get competitive prices on Platinum Extended Warranty from Lexus, not 3d party. . I'm confused about the various terms of the warranty. My last car, a Mercedes E-320 I purchased an additional 4 years for a total of 8 years and a max of 100k miles. I received a quote from the dealer I bought the GS from. For $2,000.00 I can get a Platinum, 0 deductible good for 7 years or 75k miles. Is that a good price?