The Silverstars are definitely the best headlights that I have had in my car. Highbeams are a great improvement over my old ones. If you want lots of light though, I recommend Hella's ff500 auxillary lights. Those things you can feel the heat coming off of them, and I wouldn't drive down the road with them on if I knew someone else was coming, unless I seriously wanted to blind them.
BTW is there a major difference between 9004 and 9007 bulb styles? I looked at both plugs, ands they seem to be the same, but the 9007 silverstars have a higher lumen rating than the silverstar 9004s. Any Ideas?