I fitted the Phillips bluevision and was very impressed. They gave much better road illumination. They give off a very white light so do actually look like Xenon lights.
Cost £50 for the 2 H7 and H1 bulbs plus the sidelights which are free with the H7's
Another vote here for Philips Blue Vision. Much clearer view than standard bulbs and on my Imperial Blue Leon the very slight blue tint looks nice. Can't say I noticed any difference in spread or distance though, (didn't do a side-by-side comparison), but they certainly aren't any worse than standard.
I replaced the Mains and Dips and got the free sides from here:
http://www.xenondirect.com/product.php?productid=16138&cat=257&page=1
No probs with delivery.
Cuprablue
edited to add - All those who buy +10%/+50%/+80% bulbs and are disapointed I would just say...
How do you know what to expect? Do you really know the difference between a 50 or 80% brighter bulb?? Without specialised measureing equipment (light it measured in candelas not watts btw) you are just guessing about how bright the bulb should or shouldn't be.
Remember also, they are MARKETING CLAIMS.. to be treated with a pinch of salt. You sure as hell aren't going to be able to get your money back claiming the "50% brighter" bulb you bought was only actually 40% brighter for example.