jason
you can get about 200rwkw +/- out of the stadard turbo which is is pretty close to what you are asking for.
i wouldn't rate the turbo as the first thing to do. why not save your money for a little longer, get the rest of the gear, tune it, drive it then see how you feel.
given the price of the new turbos for your application i would be buying new.....unless i personally knew the history and the owner. (something i just did btw)