For what it's worth, the front sway bar VS put on my car is a half inch.
This has always felt just about right - the front of the car feels pretty flat through a corner and handling is mostly neutral.
Up to a point.
It's the rear you have to pay attention to - lots of attention. At its limits, the back starts to get 'squirrely' as the swing axle begins to tuck under. You can go just a tad harder if you want to slide the back a little to tighten your line, but push it past the magic point at all and you're asking for trouble.
Me, I don't want no trouble, here.
I seldom push this car much past about five tenths.