Have you got the car yet? If not look at getting a Quattro. They're much rarer and more expensive, but the insurnace was much cheaper for me at least than a standard PD130.
As for performance you'll be limited to about 220 crank hp on stock injectors. You'll probably see 200chp on a hybrid turbo, a lot of people overestimate the figures.
If you go looking for big power you can get 260+ with injector nozzles, and GT2260. Add an FMIC, EGR delete to keep breather system clean, straight through exhaust and a decent map. Also budget for an uprated clutch and a new flywheel or SMF conversion.
260hp will cost £2k at least.