I'm looking for a good set of halogen lights to use as high beams, and read lots of good reviews on the Hella 500's (especially with 100w bulbs). I have room for a ~6" diameter light (I know the 500's are almost 7") and was wondering if there where any better/cheaper alternatives? I'm looking for a round light.

 

Vision x makes sealed housing hid's in 5" or smaller