Apologies for being an elitist/snob, and perhaps being out-of-touch...but:
Based on what you've said and the parts list you've included, I get the strong impression you are working on a really, really tight budget. Projects like this always go over budget - and usually by a LOT. If you are concerned about a couple hundred herr and a couple hundred there, I caution you against proceeding with a build like this.
Also, I know that $200 for a chinese turbo off ebay seems way better than $2000 for a fancy one - but there is usually a (good) reason that inexpensive parts are so inexpensive... I've seen (and had) some successes with inexpensive chinesium parts - but I've seen (and had) a lot more successes with higher quality stuff.