I dont think there is too much difference between all the sets of lines. Get the ones that you think look the best and have a lifetime warantee. Make sure they are covered and not the bare stainless braiding on the outside. You should see how fast an unsheilded set can eat into a motorcycle fork.
the nice thing abooot the Speigler lines is the adjustable ends, you shouldn't have to adjust them as they are made to spec.. when i did my Gxxxr fe, they made the 'up' line however long i wanted it!! twice!! lolo "you can always make it shorter" he said in the German accent..i just dealt with them direct as they are just in Dayton, abooot 35 miles from the house..
If you are doing the GSXR front end conversion, what would be a better brake line? The SS, or the Superbike?? The ss has the banjo bolt fitting, the Superbike has the "Direct thread in" lines. Does that just make the whole set-up truly radial?? Or is there any difference??