ok, here is a post full of info on what all that means, set up by the magnificent el pres. http://www.bmw-forums.com/forum/inde...howtopic=22996
projectors- they are lens which the light from the bulb is sent through that distributes the light evenly across the road.
DDE- kind of angel eyes, they are known to be some of the brightest (don't go LED angel eyes, from what i hear they are no good)
HID- High Intensity Discharge, means the lights are brighter, whiter, and give off more light
when buying headlights go with ZKW. and your on the right track with umnitza, they have good customer service and quality products. However, the DEPOs are made to signifigantly lower quality than the ZKW and when you buy headlights you dont want something that will break or fog easily.
most of the people here would recommend... http://www.umnitza.com/product_info.php?cP...products_id=154
they are expensive, but worth it, and you will definately turn some heads!
hope this and Pres's posts help.