Hotchkis has bars in 1.10" range. They've found that's the best compromise in ride and handling. They use their 1.25" hollow sway bar.

I run 1.18" with an aluminum headed small block and 1.125 solid sway bar. Next change in my front end is to go to better shocks and the hotchkis front sway. Currently my car oversteers a bit. The Bilstein Shocks feel to be beyond the limit of the torsion bars. The ride is stiff. Not skip across the road stiff, though.

Another thing to consider is fatigue of the chassis with stiff bars. The unibody can become the spring and that will stress all the hundreds of spot welds.

I used to run the 1" bars and found them much better than stock, but still soft. My jump to 1.18" was a vast improvement and right now, I don't want to go to 1.22".