Dude, You just turned 68, and are planning to buy "your last guitar ?" Lets Hope Not !
I just turned 69, don't play half as much as you. Don't have the skills to play in public without getting stoned (no, not drugged, folks actually throwing rocks at me )
And I now have 2 more, possibly 3 guitars in my acquisition planning schedule !!!
THE GUITAR YOU LEFT OFF YOUR LIST : and probably the coolest is the SE Hollowbody II
It , like the S2 McCartys has the 58/15S pickups (in probably the best install for them)
It's neck carve, "Wide Fat", is not really either, but very comfortable for even a small hands dude like myself .
The S2 594 's are indeed beautiful, but have the chunkiest PRS neck carve, in that Pattern Vintage
The S2 594 Thinline , I have (as well as the HB2) and despite its "petite" size, is a winner from head to toe, and is a sweetie as well . There is something about the density of the guitar chassis (I'm a former car guy, so I think in automobile terms) where the less dense chassis (Thinline & Hollowbody) seem to be a better home for the 58/15S
A pickup winder guy said once in general, that lower output pickups , like Alnico 2 PAF types , sound better is less massive guitars . That in chunkier guitars, Like the LP and The 594 DC/SC, an Alnico 5 is a better match..Clearly just speculation here, as PRS don't say what the heck is in the pickup, but it would be interesting to know ...
It also might explain, why folks that buy the Hollowbody and the Thinline, seem to like the 58/15S pickup set, more so than folks that buy the 594 DC/SC chassis ...
With the stuff you are considering, you will not make a mistake. But you will have to return later, to cop the ones you did not cop on the first pass !