I put an Xparts bumper on a while back. At the time I was unaware that you could put a genuine GTI/GT bumper on without changing the carrier etc, and genuine bumpers were extortianate. If I had my time again I would have a genuine one resprayed my colour, but there are many more available now.
I actually put the GT grilles on, and also genuine corner mouldings. The pic below has the Xparts honeycombe lower grilles, which I have since changed for genuine GT slatted ones.
It's my favourite cosmetic mod to the car and is a million times better looking than the standard bumper.