Well 07 US 3's come standard with a 3 year 36,000 bumper to bumper, and 5 year 60,000 powertrain warranty as of this year. It changed from 06, when it was just a flat 48 month bumper to bumper. So I paid I believe it was around $1300 (i'd have to go back and check paperwork) to upgrade the bumper to bumper to 5 year 60,000.
edited to add- and I paid I think 500-600 for the extra tire warranty, which is if you get a flat or blowout or whatever for any reason, you tow it back to the dealer and they give you a new tire for free, not even prorated, as long as there is 2/32nds tread left. And the warranty also stays in force even if you buy a new set of tires, for the full 5 years, no mileage limitation. So that sounded nice since the dealer price for the stock tires are $224 each I think. I think I priced the same size tire at other places, and it didn't look like those size tires were cheap. Oh, and it also applies to the wheels as well, if they're damaged you get new ones, if i'm reading this correctly.