Well I cheaped out and bought the Dynavector XX mk II. I hope not to feel bad 6 months from now, and I have had that feeling before, so I know what you're talking about. It's just that when you get caught in this upgrade fever, if you don't watch yourself, it never ends. If I had spent the 50% more on the ZYX, then maybe I'm thinking I need a better amp, table, phono stage, preamp, cables and/or speakers next because the cartridge is too good for the rest of my rig....it never ends, and I don't want to get sucked back into that merry-go-round.
I've owned 3 ZYX's, the Airy 3-S SB, UNIverse-S SB and 4D-X SB2, and yeah, ZYX's are great cartridges. I have down-sized significantly in the last few years, and in the last two months I have started to creep back up again. I wanted to get a LOMC for my new LOMC phono stage, and I think the XX mk II will mate well with my VPI table/arm.
Maybe I'll hit the lottery and get back in the big leagues again, but I'm not holding my breathe or gonna worry about it. Hopefully the Dynavector will fit in well.