I know there are many thread about turbos in the forums but still need help

My 02 bug eyes begin to leak oil in the turbo intercooler and begin to lost power now i know that is time to change the turbocharge ( 14 years without any change or upgrade) I just surf ebay and they offers a lot of turbos very cheaper from $200 to $ 400.00 etc..., There are a lot of suggestion about what to buy :I see this: VF34 ,that is expensive but need to be expensive to be good?
What about the original one and the ebay options?
any help will be appreciate,thanks.

 

Vf39 is pretty damn good I love mine. What fuel mods do you have and other mods?

 

No modification in my car is OEM.