The S4 Biturbo is a fantastic car, and great value for money at the mo.
The engine is the BEST that VAG have ever developed, bar the RS4 version.
Its smooth, sounds lovely, is reliable, and is so tunable.
The build quality of the Audi is far superior to your current Golf.
Door shuts, wind noise, sound proofing etc is much better.
And remember, you get a hec a lot more for your money too, with xenons, lighting pack and
proper 4wd Quatt.
Spend 500 quid for a remap up to 320bhp, and around 4k for a RS4 turbo kit for around 400bhp.