I wish I'd went for the xenons when I was getting the mk5. i though at the time "there's no way I'm paying £700 quid for fancy lights", but the do look pretty cool tbh. I put the philips xtremes in mine about a year and a half ago, well worth the upgrade from standard bulbs.
I agree the OEM Xenons are quite expensive, especially when compared to the cheap Korean retro-fit kits available over 'tinterweb. However, when you realise that the retro-fits are illegal (unless you go for retro-fitting the entire OEM setup, including levelers, which would be a real ball-ache) - and you discover just how good Xenons are (especially so when you get a courtessy car without Xenons 
), you will (a) never go back to halogens, and (b) realise that the £700 was really worth it. 
For those out there who just couldn't quite get their pen to reach the "Xenons option box", and give it a tick on the order form, 
then the Philips Xtremes are a very good and worthwhile upgrade - and www.PowerBulbs.com really are the best place to get them from. I've been using PowerBulbs.com for years, and they only sell quality kit (and not cheap junk from korea or china), have really superb customer service, are very "open" and honest (they will not sell you wrong stuff, or stuff you don't/won't need), and when I met them at Inters this year, the bloke from PB was a really great and funny guy. Anyway, enough of my headdy recommendations of PowerBulbs - to maintain "neutrality", a-la BBC, other online bulb sellers are also available! 
Here here..... PowerBulbs all the way.
Here is a little story that may make some of you chuckle, I am a Yorkshire lad, from a place called Ossett and I am currently residing in Dublin. Well I did a trip back to Yorkshire a few months back and when I returned to Dublin I ordered a set of H7's for the Golf from Power Bulbs. Wasn't I surprised to see the address of PowerBulbs was in Ossett. Oh well maybe it wasn't that interesting
