I wonder how long before someone gets their hands on the R32 engine?
I'd go old skool Mk1 Golf, clean body, lowered a bit, 4wd, completely uprated brakes, R32 engine, big shot of Nitrous, heavy tuning.
Although, I did have a thought recently about doing something to a very old skool Mk1 Polo. Not many of those about.
What about the other VW engine options:
4.2l V8 petrol or 5l V10 diesel (around 300bhp each) from the Touareg or W12 (6litre, 400bhp ish) from the Phaeton although you'd probably not get those for ?10k