Well, my line of thought is that the Crystals use titanium domes, as opposed to silk. Not having heard these particular Crystals, I'd say that your preference for the Crystal's highs is probably attributed to that difference. If you find silks too laid back and titaniums just right, a metal-dome might be more up your alley.
My view is that Focal is the king of the titanium dome. MB Quart is up there as well. These are more likely to sound like the Crystals than something with a silk dome. I'd think the Crystals would have a lot of similarity to the Kevlar-mid, titanium dome Focal Polykevs that they bear a striking resemblance to. My guess is that Crystal had those in mind when they designed the more-affordable SSCS. So, if I had to think of something similar to the Crystals, I'd go with the original, Focal.
But it begs the question: Why don't you just get 5.25 Crystals if you like them so much? Purely budget?