There are certainly good other flavor MTL tanks. A lot will depend on what you are looking for. I agree the Kabuki (and I have a couple) is probably the best flavor tank for the Bvc coils although the Ijoy Elf also accepts them and is a nice, easy to use topfill tank that fixes many of the Nautilus 2 problems.
If you want to branch out to other tanks and coil types, the Ego Mega One V2 is a good tank (comes in 2 or 4 ml versions) but you have to get the right coil for it. The coil is Joytech's CLR coil, it comes in 1.0 or 0.5 resistances. Great MTL flavor the coils last a long time, and can fairly easily be rewicked or even recoiled if needed. The Tron-S also accepts this coil.
I find the Innoken Zenith to be a good tank, it is 4 ml also and has proprietary coils and they do last a long time (comes in 0.8 or 1.6 resistance) and it's just an all around, solid, well designed tank. IT's 24 mm wide, so you need a mod that would accept that size and etc., but it has one of the best topfill systems out there, IMO. I'm imagining a 2 ml could probably be obtained given TPD, but I haven't run across one yet, and I'd imagine they shrank the diameter, although not all tanks do that to move to compliance but I guess you could check, if the idea appeals to you.
If you want to build, probably two of the easier to build tanks recently on the market are also great tanks at a decent price point (IMO) the Siren V2 (I have several, in both 2 and 4.5 ml configurations, and I like both, and they did a 22 mm version and a 24 mm version, so it's flexible. The Innokin Ares is a fantastic flavor tank as well, with slightly more adjustable airflow than the Siren V2. Well, it's not that you can't reduce airflow in the Siren V2, but I find it tends to run better with airflow wide open, your mileage may vary I guess. Otherwise, a Vandy vape berserker might be an option and there is a mini, 2 ml tank for it that is 22 mm, I believe, and the original can be run in either 2 or 4ish ml configuration, it's just wider than the 22 mm. Great flavor tank, pretty restricted draw, if you like that sort of thing. The doggy style (it's really mostly obtainable only as a clone without shelling out major funds and a wait since it's made in Europe somewhere I think, but fasttech carries clones for a reasonable price. Everyone seems to love this tank as a flavor tank, IMO it's a bit harder to build (for me, but I have a fine motor tremor). However, those folks that have them seem to just love the flavor and typically pick up several more.
Hope any of that was helpful and etc.
Amna