I have 145kw with stock pistons at 14 PSI. Planning to get a bit more out of the stock pistons yet,
You need to decide what you want power wise. Personally, I think the 2TG head is a good option if you want to use a big turbo that needs high RPM to get maximum power.
For normal street use and up to around 200kw I think a 3T GTE head is fine.