Update: Over the weekend I installed the HID kit that mvpmotorsports had drop-shipped to me from Phoenix Microlite (I've also seen this company referred to as Pacific Microlite, and I'm not sure which is correct). Install was plug & play, no cutting or splicing. And everything fit inside the stock housing. The only trick is finding a place to mount the ballast/igniter, which I did by wire-tying a flat piece of plastic on the inside of the rear cover in between the two upper bolts that hold the cover on, and using the supplied velcro pad on the flat piece of plastic and the ballast box. Using a plastic piece was necessary because the back of the cover has raised fins on it and doesn't have enough surface area to stick the velcro pad on. You will also need to change the two mini-fuses in the fusebox for right and left low beams from 10 amp to 15's, as suggested in the instructions (I tried it without it first and promptly blew a 10).
I haven't had a chance to thoroughly evaluate the light pattern, but just looking at it in the driveway and garage it looks very similar to the stock one, only obviously much brighter and whiter.

This kit was $505 and consisted of all Philips components (the bulbs and integrated ballasts/igniters). So far I'm very satisfied with it.