So I got new 9005 and 9006 bulbs. They are Sylvania SilverStar Ultra bulbs, available at AutoZone for $25 each. I looked at the low-end Sylvania bulbs. I looked at the PIAA bulbs. I decided to try to SilverStar Ultras because they promised to cast a brighter path. They don't promise anything like purple or blue colors, for those who are impressed by that sort of thing.
I have not ridden at night with them yet, but just turning them on, they are much brighter than the near-six-year-old OEM bulbs (which were some sort of Sylvania). Sure, anything new would be better than those old OEM bulbs, so I am looking forward to seeing these on a unlighted road.
Thanks to all who provided guidance on this topic.