There's no difference between the "pre-lawsuit" SCs and the new SCs of the same model, is there?
Actually they are not offering a 24.75 scale they are offering a 24.5 scale.
You are correct that it's only offered currently on the singlecut.
Offering the shorter scale length is just PRS giving options. I think they purposely avoided the 24.75 scale length to avoid another possible Gibson lawsuit. I'm very curious how the 24.5 guitars sound. Do they do the Les Paul sound better than their 25 brothers?
To me, an angled headstock does more for sustain than the scale length, it also has a tighter feel (my Strat has a "loose" feel to me). But yea, shorter (ie 24" or 24.75") do seem deeper sounding, while 25.5 is more high-end focused. I really like 25" scale lengths, though. Any PRS or Carvin with that scale length always sound very crisp and balanced to me.
I like the clips of the SC 245 on the PRS site; I'm not going to compare it to a Les Paul, but it does sound great and that's what counts.
in general i find longer scale lengths to be articulate souding and the strings seem tighter..although since i base that off my fender strat, the maple neck and bolt on construction could have an effect on the tone..
one thing i also noticed with affects tension is the string angle behind the bridge..(strat trem, lespaul tunematic)..
its why some paul players top wrap to lessen the string angle behind the bridge to get a slinkier feel. i personally don't top wrap on my gibson les paul because i dont like floppy strings..
i want to try the newer prs's just to see how they compare..actually i have never in my life played a prs..