I only purchased one in my entire life. And it was on a gift to a family member, to ensure that they wouldn't have any issues if it failed. Other than that, I always hate the dreaded extended warranty sales pitch. The sales guy gives it to you and then the cashier is also required to run down the list of options even though you say you are not interested up front.
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CPU: 3.8 ghz 3930K, 16gb DDR3-2133 Memory, 120GB SSD, 1TB SATA HD, Gigabyte Geforce 680 GTX, 27" ASUS 2ms LCD. Rosewill Black Widow Keyboard, Cyborg RAT 7 mouse,Win 7 64 bit.
also:
Alienware M11x R2