I'm looking for a new fancier turbo for my project. I don't dare to order from Ebay since there is sold a lot of Chinese crap. So i'm asking where do you order your stuff?

Looking for a k03"s" aka k03-52 or similar, something that is found on the 180hp A3, Golf4 and etc. It should be new or well refurbished at least.
Thanks for your input.