I was not fond of the PRS SE acoustics. I wanted to love that guitar. I ended up with a Martin (and spent more than I intended since I had to have a PA made Martin (I live in PA).
I think based upon your collection that a Custom 24 would definitely add to it. The Custom 24, to me, represents the best features you can put on a guitar. Yes, definitely things I'd change, but I can say that about all of my instruments. The PRS guitars always just feel "right" in my hands, regardless of minor things like a toggle instead of a blade switch. I own strats, I own soloists (super strats), LP, blah blah blah. What do I reach for 95% of the time? A PRS.
I'm not sure how you have your strat set up, maybe you want a dedicated single coil sound from your strat, maybe you want one of your other pieces in an alternate tuning. I just don't think you can go wrong with a custom 24. SE, S2, or Core, doesn't matter. As long as you're not going to go without food or miss a bill payment, I'd say get one!