I've had both the Bilstein RCD's and the Hotchkis Fox non-adjustables on my Duster. The Bilstein's are a HUGE improvement over anything like the Monroe's, KYBs, etc. The Fox shocks I feel do a better job with the 1.12" torsion bars I have on my Duster. Not that the bilstein's didn't work well, because they did, but the Fox's just take it up another notch. The ride is a touch firmer with the Fox's, and I can tell that they do a better job damping the 1.12" bars.
For cars with smaller torsions bars, even in the 1" to 1.06" range, I think the Bilsteins would probably be all that you need. To go bigger from there though, like the 1.12's, the Fox's are definitely a better match. It's just about matching your damping needs to your spring rate, and the Fox's do a better job keeping up with the larger bars. At least in my opinion.