Hey Horsemom, welcome to the world of biking! I also came over from horses to biking (not endurance, though), and instantly came to love my MTB. (Although I think my MTB has thrown me off more than the horses, and that's saying something considering my last horse! No major injuries from my MTB though, which can't be said about the horses).

No ideas for names, but good luck with your duathlon. Feel free to go the the triathlon forum to ask any questions you have about duathlons and tris there, those girls, like the girls here, are great resources to use. I definately do!

Have fun!