more power than the polo?

The Polo GTI is IIRC 1.6 litre 125 bhp (and mine isn't a GTI, merely the 75 bhp 1.4 litre)
I think the 206 GTI is 137 bhp and 2.0 litre.
I do believe someone has managed to stuff a Golf 2.0 litre engine in a Polo...

Another couple of fun little cars are the VW Lupo GTI (same 125bhp engine, but even smaller and lighter car) and the Cooper S...

/Michael