Oh! Sorry, I did not know that.
For H7 aftermarket bulb, either Osram & Philips (both European makes) are better than any domestic ones, like Silverstar.
Here is a reputatable UK online site sells the mentined brand. If you want to go with the closest HID/Xenon look, Osram Cool Blue Hyper would be the one. It's rated at 5000K. Not sure if the price fits your budget. Right now, there is a special discount of 15% off the total purchases up to Dec 24/11 (incl. free shipping world wide).
Voucher code:
Winter15
http://www.powerbulbs.com/store/cate...fitting/h7-499