Thanks everyone - i really appreciate the advice. On the basis of the feedback I have got myself a 2nd hand milltek - full 3" system with cat. I'm not sure how restrictive the cat will be though and am considering getting the de-cat downpipe to run day-to-day.
Was very tempted by the Revolution.
The GRD is a great exhaust, but just too loud for the kids! May be posting it in the For Sale soon if anyone was interested as the missus is getting fed up with the car parts everywhere. ("why do you need 3 exhausts, 3 sets of wheels, 12 brake discs for one car" was the comment last night