Just to elaborate on what SpAmRaY said, the PBT dyesub sets in the SA family that Signature Plastics began selling recently are uniform row3 profile only. They aren't sculptured rows like most SA sets. I find that uniform R3 sets work nicely on small boards like Pok3rs, so this might not be a drawback for you either.
Also, Signature Plastics is so backed up with SA group buy production that any new group buy that starts up now (or next month like will be the case for SA Dasher/Dancer) won't actually see caps shipping to customers for several months.
Having said that, SA keycaps are definitely worth the wait. SA is my favorite keycap family. If you can't wait, you might try doing what I did last year and scour the classified threads of this forum and Deskthority for people selling SA sets they don't want anymore. That's how I scored PuLSE and Round 4 SPH.