I'm just in the process of doing a facelift on mine - including the sportline front splitter etc - I'll upload some pictures when I get finished.
I think the price ranges on whether they're fitting genuine VW parts or not.
You can by the full kit from just kampers for circa £1500 but I'm guessing most of that is non genuine VW.
The stuff I have is a mixture of both but if you're planning on the sportline look don't skimp on the splitter- there's some nasty ones out there and by the time you're done it'll cost you a fortune for the body shop to fit it.
Look up the 'big ally' one on google that seems to of had some good feedback.
Also the cheaper option comprises of some of the headlight and bumper bracket being fabricated out of bits of aluminum
rather than buying the correct vw face lift support panels. I think mines going to finish up costing me about £1750 by the time I've done - some genuine stuff - some not - but I'm happy with the results and it's going to look awesome!- just my two pence worth!