If you need Shimano SPD, the Rally is one option; the SRM X-Power is another. If you're after SPD-SL, the Favero Assioma Duo-Shi are a good option, though some assembly is required. Look Keo cleats are also available from Favero, and Wahoo Powrlink (that is not a typo) will do Speedplay. (No, autocarrot, I did not mean "speedily".)

All of those are good options; I'd have no qualms about running any of them.

Honestly, my advice - especially if you're the type who upgrades bikes regularly - would be to go with the pedal-based power meters over crank based. I'm eyeing off a replacement for my 2017 Roubaix, for a number of reasons, and the main options I'm seeing out there are all 12 speed, which is not (at least officially) compatible with my Quarq spider power meter. That's... mildly painful, to say the least. I opted for the Quarq because at the time, there were no SPD-SL pedal power meter options available.

Good luck.