As far as wastegates goes, I say get as best as possible, but stay w/in your means.
Remember, this controls your boost & you should not skimp here.

That being said, people have used cheap ebay units & knock off HKS, Tial, etc with good results.

Just do some research & try to see if people have posted reviews on there products, forums talking about these different brand units..

I have not used any SPA wastegates, but I believe they are sorta popular in Brazil & seem to be OK.

MBHD

12 port SDS EFI