"aggressive" isn't the right term to use about the larger bars.
These cars were massively undersprung in the front from the factory. The stock bars were for use with bias ply tires and shocks that are mediocre (at best) compared to todays standards. With a set of radial tires and good shocks you can double the stock spring rate and still have a car that isn't "aggressive" feeling as far as ride or handling is concerned.
I ran 1" bars from Just Suspension on my Duster with 225/60/15's. It was still what I would consider "soft" for ride quality, and it still had a ton of body roll. Those bars have a wheel rate of around 200 lb/in, which is double the rate of the smaller stock bars. Now, the 1.12" torsion bars I installed after that probably fit the "aggressive" bill for a lot of folks, but really even with those bars the wheel rate is on par with a lot of modern vehicles designed for sportier handling.
