I would go for a stainless system mate, i got mine from one of the guys that advertise in the golf magazine, mine is a Magnex Twin DTM, can post pics if you want, and is a cat back system so it goes from the cat, i would personally de cat the car as you will only have to put it back on for your MOT.
So get looking in a copy of GOLF for a suitable stainless kit. Mine cost me ?311 delivered, not bad when i got quoted ?145 for just a mid pipe from kwik sh1t.