The best route is to swap out sealed beam units for H4 housings and H4 bulbs...
I run IPF Housings and IPF X51 Fatboy bulbs. They absolutely blow away anything even close to their price range. Another buddy runs Silverstars and our side-by-side comparo was a joke.
Sure HIDs are cool. Unfortunately, however, nowhere near practical for road use. Friends of mine run HIDs in their rally car, and there's no chance they could be run on the street. Besides that, the investment (if it's done right) is enough to run most folks the other way.
Perhaps there are some retailers, etc. calling their lights "HID," but if it's the true HID vehicle lighting you're looking for, it's quite a pickle to get into.
Dutch