The black/red is nice and black will hide more dirt than white does. I know it sounds backwards but I had a black car followed by two white ones. The white cars have been much more of a challenge to keep looking clean. It's weird.
Another option is red on red. You don't see it very often and it could work well. LMB/FR is a combo that some love and some hate. I'm not a huge fan but it might be to your liking.