35w is very bright in an HID.
As for color, the more "blue" it is, the less usable light you'll have. Go with the 4300K or 5000K if you want the most effective lighting for night time riding. Look up lighting color charts - you'll see the the lower numbers like 3000K are into the yellow spectrum, and the higher number like 7000K are purplish.
For reference in the image below, on my Triumph Sprint, I run a 3000K on the right (yellow to be noticed by cars), and 4500K on the left (to light up the road).
Haven't upgraded the Vmax yet, but I'll go with a 35W 4500K hi/lo. Too many other mods ahead of that though, and not enough time and $!!