The ebay ones arn't balanced to the quality of nissan, slide, GCG, HKS turbos
With that budget I would buy another stock one.
Save up then you will have money for FMIC, hi-flow, aftermarket turbo etc if you wish to go down that path.
I have heard of people with the ebay ones lasting long with good power and others with the turbo going within weeks. Just not consistent enough.