I need to put my favorite saying in my sig – You Get What You Pay For. I personally would pay the extra money … now, don’t get it from the dealer directly, I’m sure like in the US (granted, never been overseas, or even left home much) but I’m certain you can find the same part, made by a reputable company (BorgWarner, where I worked, was one, there are plenty of others) for $500 or so. Now, keep in mind, the precision of a turbocharger, you need to have someone actually doing QA/QC on each turbo to get good quality products, and if you just pick some guy named Lee (because you said chinese manuf. I’m going with a chinese name here… follow with me) off the street and tell him to measure each one, and keep in mind, they’re probably paid based on how many pass, they’ll let a lot of lower-grade components go through (not just blowing hot air, I had to train a bunch of the guys at the manufacturing center from Beijing how to use some tools I designed, and they kept trying to take shortcuts that would reduce quality significantly, and I kept having to tell them they can’t do that) that could do significant damage to more expensive parts, like, say, idk, your engine.
I’d go with the Toyota dealer parts before I’d just throw some random ebay find turbo on my vehicle, but that’s just me…