I think that the SLP-98 is a work of art. How long has it been in production? I keep it as a regular search item, because I enjoy seeing them in their different iterations. I've never heard one, but maybe one day. I tried a bit of Dennis Had's Inspire gear (two preamps and a power amp) with my Omega system for awhile before going to an Aric Unlimited II preamp. Nowadays I'm thinking I might like to try a 6SN7 based preamp.
So I'd love to pair an SLP98 with the Aleph 5. There's a sweet Jaguar red F1 version on the lists right now. On the other hand, I might like to hear the Benchmark as well, because I appreciate yyzsantabarbara's system choices.
I had an XP-12 briefly, and felt that it would require a system-wide makeover. I felt that my then current sources were not up to the resolving potential of the XP-12. I found an X2.5 which I found to be quiet and musical, and still overbuilt. It has the infamous brick of a remote. I see two for sale today.
I suspect that you might like the Cary, given your existing phono pre. They both do seem to change hands often enough with continued interest. And if you would consider at some point, I'd enjoy a picture of the AR9s.