Maybe in the 80s lol? You can tune a turbo car to deliver power however you like and tuning has become quite sophisticated these days. Want a tune for high mileage? No problem. More power? Sure. No lag? simple. All 3...well not that sophisticated lol, but you can run different maps as needed.
The handling is spot on with the stock MS3. Where the problem comes into play is turbo and FWD; though they say they limit boost in the low gears, it still has a ton of torque and in hard cornering (I scared the salesguy...) you still get torque steer. Controllable in normal driving, but to get the most out of it in a corner (sounds like part of the goal here), it will take some good throttle modulation, possibly some suspension upgrades, tires, etc... but I was pretty impressed with the handling stock. Not the same with the WRX, which is tuned more for spirited comfort, but it is AWD and easier to drive fast and there's a boatload of parts for it.
I really like the new Mazda 6 as well, and two friends have CX-5s and I have to say I am impressed with them also. Mazda is on a roll.
Have you considered just doing a suspension package on the current 3 (many MS3 parts should fit)? Just upping the handling capability of the current car might suffice, as it makes things even more fun, but if it is power you're after, I'd be looking out for a clean MS3.