Tiguan Stage III anyone?

Starting to look at our next car upgrade and I've always liked the Tiguan
The Polos always been fun but I never intended keeping it long term (can't see it handling the dog and kids in the future too well ) My GTIs spec'd as my signature and I don't want to go backwards in performance with our next car.

I'm looking at 2010/11 DSG Tiggys. Looking at the APR upgrades, there's the usual K04 conversions and a stage III option. The K04 kit looks to be the basic turbo upgrade and software for $4400. Stage III comes with an intercooler and intake for $8295.
Has anyone had any experience with either of these upgrades or taken their own routes? I want a nice definite shove in the back when you give it some stick, which I still feel the Polo lacks. Is this kind of expectation realistic? APRs Stage III shows 400hp and 500Nm+ torque. I might sound a bit naive but I can't say I know how those figures would translate to how it feels on the road. If anyone's owns or had a chance to be in a 2.0TSI with those kind of power levels feel free to comment I'm curious on the characteristics of the engine, I know you can't directly compare a 2.0TSI making that power to a V8 making the same power (which i like the feeling of!)