250hp in a cx-5 would be the bomb.
Let's see, I've recently driven the Mazda2, 3, CX-5, 6 and MX-5 - they're all models of restraint.
Yet the chassis are so good they could handle substantially more hp without suspension mods. If Mazda is too conservative in any area it's engine options I think - everyone wants power. But really the CX-5, and all Mazdas frankly, excel in nipping around and being quick, not fast. That's their take on fun. Plus I like that their interiors don't give me a headache.
Anyway here's a take on "fast" (stock 167 hp engine). The "obstacle" is a gt3 rs:
http://www.youtube.com/watch?v=tQ3x462rlmg