Questions about torsion bars?

I don't understand why Firm Feel lists a set of their 1.00" torsion bars for $339.00 and PST has a set of 1.03" bars for $239.00. Is there a big difference in quality? Or should I go with a set of mopar performance .990" or 1.040" bars didn't check prices on them yet. The car is a real 67 383 Dart, 4 speed, manual steering 16:1 ratio firm feel box and has 6 leaf springs in the back. I want the car to handle good but not pound me to death when driving. Maybe I will eventually upgrade upper and lower control arms at some point and I will be switching from kyb's to bilstein's or fox shocks.

Carl

I bought a set of the PST 1.03 bars and am really happy with them still after 5 years.
They brought the tension up so I don't hit the bump stops all the time on our crappy streets, and they cut down on the body roll quite a bit.
With a 318 and 5.9 both, the 1.03's are tight enough that I needed a small ding in the header tube. (1/8 inch)
Also if you decide on the PST's we get a discount that makes them about $200, but you have to call them to get the FABO member discount.