When I had my stock taillight I think I swapped out the 1157 for a 2357? I think that was it, same running light wattage, but much brighter as a brake light. I thought the stock light was actually pretty good, you'd be hard pressed to find one bigger, it looks like a trailer light.
When I went with my new light & plate mount I also changed out the turnsignals. The turnsignals I purchased had the option of being wired as running lights. I considered it for the additional visibility, but in the end decided against it, at least for now. That's always another option.