Before you rebuild that 2.0, why don't you sit back and think about what yourr budget is and what your end goals are. I was about to rebuild my 2.0L, even bought pistons and rods. Then I did more reading and talked to a few shops and it turns out buying a new 2.5L OEM STI block and machining the 2.0 heads for a hybrid wasn't that much more expensive than rebuilding the 2.0L. Not only that but you end up with a stronger, brand new motor.
Just take a look at a cheap hybrid build with an OEM shortblock before you commit to a 2.0L build.
Good luck!