You won't find a higher wattage/performance sealed beam, other than a Sylvania Silverstar which aren't that great. We had Silverstar sealed beams in our '97 S10 and while they were a little better than stock, they weren't worth the time or money spent.
You can get 7" round housings that accept H4 bulbs that are higher wattage. H4's have the same 3 prong plug as sealed beams so it's a direct swap. I have Cibie H4's in my daily driver and they're extremely nice lights. They have a very wide low beam pattern with a sharp cut-off that keeps glare to a minimum. The high beams are very center-focused for a ton of long distance visibility. I have a relay harness and 80/100W bulbs.
Cibie's are available from Daniel Stern Lighting. Scroll down the menu a bit to find the 7" version.
http://www.danielsternlighting.com/p...ducts.html#Buy
We ditched the Sliverstars in the S10 and bought e-code Hella H4's, a relay harness, and 80/100W bulbs. The low beam is great, but the high's are aimed just a little higher than they should be. Seems to be the only drawback to Hella's, and it's not a big deal. The high beam is more of a spread than the Cibie's so there is less distance visibility when comparing the two. It's still plenty of light to drive at 65-70 mph at night.
Cibie, Hella, Marchal, or Bosch H4's will all give way better performance than any sealed beam will. If the bulb burns out you just replace it and keep the housing. All of them have fluted lenses so they don't look out of place on an older car- no funky clear lens or modern projector styling. The best deal I've found is Hella H4's for $70 a pair from Bus Depot. They sell the bulbs separately so you can pick your wattage.
http://www.busdepot.com/0301600118
These are my Cibie's.
Hella 7" H4's.
Night pics with the Cibie's, this is low beam. Very wide and even lighting with a very bright hot spot in the center, and a sharp cut-off to keep light below eye level for oncoming traffic.
'06 Trailblazer SS headlights on the left, my Cibie lights on the right. The hot spot is much brighter, with no more glare than the factory GM lights.
Hella's, also low beams. Also have a very sharp cut-off for less glare. These have less upward lighting/glare than both the original sealed beams or the Silverstar sealed beams.
