I just recently installed the Luminics Krypton H10 Ultra White found here:
Luminics USA - Luminics Headlight Bulbs
Here's a pic:
I think they are pretty close to matching the factory HID color. They also look better once the HIDs have warmed up. They also sell "Titanium White" which look like they'd be prety close. Only problem was that they cost $65.00 and their projected wattage was 120 whereas the Ultra White is rated at 100w so I kept it safe. Make sure to get the H10s - they aren't as bright but they are within safe wattage range.