just be careful- you can obviously map out masive ammounts of power, but you may lose lots of longevity as you retain the standard internals.
I suggest working on the internals and treating it like an N/a engine. Strenghten it up with forged conrods, cams, pistons etc. Replace the turbo with a larger one from a similar engined VAG eg. the Audi TT 225 tubo's are larger as i recall. It will allow you to run standard boost and settings and produce far more power. THEN mess with the boost and fueling settings- that should be the last phase of tuning, certainly not the first!
I would suggest tuning concept
http://flash.tuning-concept.info/#, speak to a guy called Si if you can- he's well up on VAG engines. Hope that helps.