Thanks everyone for the great advice so quickly! I guess my first investment will be in a good RD.

A couple of quick questions:

1. With my mid-size 535xi, will 3 ALP heads fit on the front of my car? I have only seen two head setups. It would make sense that 3 would be better than 2 (with my limited knowledge) but I haven't seen it.
2. Does anybody have a link to a pictorial (or video) installation for a 5 Series BMW? I searched but could not find much.
3. Does anybody have a reputable installer for Maryland (Annapolis) area? If not, maybe a number to call or a link of certified installers? It's a big investment and I am not sure I trust my technical abilities

Thanks again everybody for the great advise and lightning fast responses. I think I am really going to like it here!