$200 seems quite low, whether the turbo needs to be rebuilt or is just crap in general (e.g., eBay turbo). For reference, here's the "standard" 20G that people use:
Subaru WRX/STi 20G-XT Turbocharger
Based on your profile pic, you have a bugeye wagon. I wouldn't recommend a 20G on a 2.0L engine (unless you're swapping in an EJ207 with full working AVCS).
Subaru WRX/STi 20G-XT Turbocharger
Based on your profile pic, you have a bugeye wagon. I wouldn't recommend a 20G on a 2.0L engine (unless you're swapping in an EJ207 with full working AVCS).