my hid on flip light:
http://www.nicoclub.com/zerothread?id=63414
I have had hid on standard reflector housings (99 accord), projector housing (94 integra), and now flip reflectors (91 240sx).
It is true that with single beam (most common) hid it eliminate the high beam but who cares... you don't need high beam anyway with hid. If you really want hid and got the bling for it you can get dual beam setup, what it means is that the ballast and the hids are able to output different brightness but I personally think it's worthless so just get single beam setup.
The only thing you should concern yourself with is the housing, I think pdm sell bosch or hella housing that's either DOT or SAE approved for either 70 or 80 bucks.
It's a good thing to have.