To be honest the 8000k xenons i have look blue when you look at them from the outside but when driving looks like a bright white light with a slight hint of blue.
6000k will be the best bet i reckon, pure white.
I had them fitted to my pre-facelift a3 with bi-xenons.
A friend of mine works at a garage and he put the car on the ramp and took off the front two wheels and changed them from behind the wheel arch liner so it is possible without removing the bumper but not easy lol.
One of the sides (driver i think) can be done from the engine bay with difficulty but passenger side is near impossible from the engine bay