If I may....
The progress RSB settings; soft @ 1342 lbs/in and stiff @ 1542 lbs/in are not even achievable. I have no idea how those #'s came to be but they are not even remotely in line with other manufacturers specs. Cobb no longer offers sway bars and I don't' think you can find them separately or in pairs anymore. So that really leaves just Hotchkis, Tri-point, Corksport and of course JBR. There may be another but no one really seams to be going with them.
Now...Bent tubular sway bars are NOT the preferred style of sway bar among racers and chassis builders. If you can get a blade style sway bar for your application; that is ultimately the way to go. So, all that is really left is Tri-point, Corksport and JBR. These are all very similar but if you look closely at the construction, cost+shipping, warranty and other fine print, well..... I think there is really only one left to consider.
There is also no need to replace rear end links unless they're bad or you looking for some adjustability.
Thanks,
Jamie