If you're planning on using HID, use it the right way -- retrofit.
If you find these a bit too pricey, since it really is but worth it anyway, then you're better off using Philips Xtreme or Osram Nightbreakers.

The Philips Xtreme & Osram Nightbreakers are halogens, hence glaring wouldn't be an issue unlike when you're using cheap plug-n-play HIDs. The former ( PhXP ) produce a 4300k-like output wherein the light is a bit from the yellowish white while the latter ( OsNB ) produce a 6000k-like output wherein the light it produces are whitish.

H4 prices:
Philips Xtreme - 1600-1800/pair
Osram Nightbreakers - 1100-1400/pair

Banawe QC prices