If you care about my opinion I would go for the infernus,comet,sandking.
Well, that an easy suggestion, since most maps have those vehicles! It can be implemented in a new map, but one consequence: we have to think up a route that's never been done before with those vehicles, it has to be something new.
Same goes for Sultan/Jester, Banshee and Turismo. Bike-race by the way is just not done. I'm not a bike-race guy, more regular car races