I've seen on some Ricer sites that sell the colored ones also sell something referred to as "halogen" ones that are supposedly bright. I have not tried them, I fear if they are truly a higher wattage they might get to hot (ours get pretty dam hot as is). I chose to get a maplight mirror and sit farther back (an option on the 2doors, 4 door guys are screwed).
Also you might want to try getting replacement lenses. Depending on your budget they arent really that much and I noticed an improvement. Mine were all yellowed and burnt from the bulb I guess. The new ones are much clearer and the light is whiter.
Also a couple tips for improving the lighting on our cars. Some people have deleted the Check panel and added one there. Some have put a small one like the glvoe box light in the panel covering the sunroof motor (considering this myself). These should help a lot since its not the light that is the problem but its location behind the drivers head.
Also in the trunk if you have an 86-87 car with the thinner lights you might be able to find some early bulb holders that had a clear cutout for the parking light so it shined into the trunk. Mine has this and it helps.
I also took a salvaged glove box light and affixed it to the top center of the dense cardboard material at the back of the trunk. That helped a lot, just rant some 18/2 security wire up to the trunk switch.
Good cheap mods.
Im also considering seeing if something could be put in the footwells, because its a bitch to find something if you dropped it.