Are looking to build or continue using premade coils?
If you want to keep with the premade coils, aspire just released some 'triton mini' coils for the nautilus that come in 0.15 ohm ni200 for tc and 1.2 and 1.8ohm ss coils the 1.2 and the 1.8 are both great tasting with a little more open draw but still a great mouth to lung vape and wont cost you but 12$ to upgrade since they will work in your nautilus and change its performance.
Another option for a premade coil tank is the triton with its 1.2 ohm coils. A different coil than the triton mini coil; however, it will turn the triton into a mouth to lung tank.
If you are looking to rebuild, some of the better Mouth to lunch rebuildables would be the hurricane from phoenix, the kayfun 4, russian v3 or lemo2.
I listed all single coil rtas assuming you aren't an experienced builder those would be easiest.
If you did want a dual coil the aqua se, goblin mini, or bellus would be some good options.
Best thing to do is follow
@vuJim advice and think about that exactly you want the tank to do, features, performance and narrrow it down a bit.