Thanks Sparky, that's sorta was I was thinking.

 

Yes the Buschur Racing 20G-9-5 is the only 20G you would want to go with, though just adding a hotside on your stock turbo might satisfy you.

 

Yeah definitely I like Ninjox's idea better. For one, you save yourself money to spend on other mods. And, who knows...the hotside alone may satisfy your power craving.
Since you already have the 10.5, just swap it on and get a retune. You may wanna port the hotside before installing as it is real easy to do.