Hello Jake,
i think Polypterus weeksi looks most similar to a snakehead - if you're still interested in Polypterids. They have also a massive head and a beautiful coloration, but weeksi isn't such an apggressiva tankmate like a snakehead. I own two snakeheads (keeping snakeheads is allowed in Germany) an my Channa bleheri is a very gentle fish, almost tame - he comes up my hand over the water(!) to catch his food. He never demolished any tankmate but my Channa gachua is not that nice guy ...
The pro for weeksi is the moderate character of this fish - although close related to Polypterus ornatipinnis, weeksi isn't so incalculable ... my ornatipinnis killed all cichlids in the tank he lived, the cichlids were half-size as the ornatipinnis. He slashed them like a shark before he ate them! Other keepers told me, that they no problems with the sociality of their Ornatipinnis.
My weeksi is a really cool guy ...
Greetings
Uwe