I've very nearly bought a PRS with Dragons on, not sure if they were 2s or not. I was actually in the market for a Les Paul but got trying out a mean black S/H PRS Custom. It was a gorgeous tone, really very warm indeed, ultra middy tho so if you don't love mids I would look elsewhere. Interesting you talk of the split options, I'm not sure how PRS wire their guitars but man those single coil tones were as funky as hell, you would never need another guitar basically, but hey I went for an LP anyway!!!
As always the best thing to do is get down a big guitar show room and check out as many PRS' as possible. As I say it has a lot of Mid range and that might not be your thing.
As for SD comparisons well thats a tough one, I'd always say that the best SD hum is the JB and does the dragon beat that? Not to my ears no but try one, you could well disagree. I'd argue that a Gibson burstbucker is better than all three of them but thats just me!