Go kitchen aid. And never look back. It will change your baking life and they are beautiful!
I bought a ksm90 off Craigslist and got screwed by the gal selling it. She claimed it was nearly new and low and behold it was 11 years old and riddled with motor problems. It died on me a few months into having it. There is a special place somewhere hot for Craigslist liars and cheats!
My second is a pro series from Costco. It was 300 but Costco offered a 50 dollar off coupon AND kitchen aid had a rebate of 50 at the time. (Total cost was 200 plus CA sales tax) My 5.5 qt mixer cost as much as a 4.5 qt mixer at wal mart when all was said and done AND it is backed by the Costco customer satisfaction policy.
Oh and when my hubby was researching them for me (it was a Christmas gift) He was told by kitchenaid that they ARE still manufactured in the US. (At least as of 2012) They also sell refurbished mixers at a discounted rate with warranties from their website (a way to get a bigger model for less money)
good luck with the choice, hope you find your dream mixer soon!