You're going for looks more than functionality then. Blue headlights, while looking cool, don't help visibility particularly in bad weather (they DO improve CONTRAST to a point). The blue that you see from HIDs is because the sharp cut off point bends the light so much that it creates a blue effect from certain angles. Some others are slightly different, such as Honda/Acura HIDs.
If all you want is the blue look, then spending your time and money on a HID kit is 100% worthless and actually illegal. The intense light from HIDs blinds oncoming drivers unless it is properly installed and aimed with a projector lens. Which means you would have to retrofit lenses into your existing headlights.
The time and money that would be involved in a proper HID retrofit just for the purpose of achieving the "blue" look is totally unecessary. If all you're looking for is the blue look, then go to your local rice shop / customization / tint place and pick up a set of blue coated bulbs specifically meant for this purpose. They're as easy to install as a regular headlamp.
Personally, I'm in the process of replacing my stock 9006 low beams with 9005 SilverStar Ultras. I currently have SilverStar Ultra 9006s and there is a noticeable difference, so I am hopeful that the 9005'* (which have 700 more lumens) will be even better. If you're looking for a very bright, clean white / almost blue look that will increase your visibility, I would recommend this along with the other members above. It is definitely different looking than standard headlights. Just my 2 cents
2001 Pontiac Bonneville SE - "SLE w/o the ugly" 3.05 gears, 180* thermostat, 35/20% tint, spoiler, leather, traction control, sunroof, leather shift/steering, automatic climate control. www.gillsystems.com