It's a rather odd thread, this. Basically, the core question seems to be "who do you think is the best racer", but the dating thing throws it off-beam. I'd also like it noted that Katherine Legge is not in fact a ChampCar driver (nobody is a ChampCar driver any more), but about to enter her second year in the DTM. And Fiona Leggate has just had her first child (to Danny Watts).
Michele Mouton is the stand-out talent in the list, so if you stick to the thread title, you'd have to pick her, in spite of the fact that she's 58. I've met her, and she's a lovely person, and she's French, ergo she's sexy. Sabine Schmidt is also the sort of hand I'd like to date, (contrast with Danica Patrick, who seems like the stroppiest person on earth).
But out of all the female racers, there's a place in my heart for Katherine Legge. She's pretty and all, but she just seems (from TV appearances she's done) like a really nice person.