In response to my last post, just checked it out and it looks like Mazda Radar Cruise Control is pretty much Active Cruise Control (all manufactures should just call it the same thing)
It comes standard on all Mazda 3 and 6 models from the base on up. See if you can negotiate a Mazda 6 Grand Touring (Turbo) to around $25k, that's one of their best model/trims.