Try Aspire Cleito tanks and coils. I've been using them since 2015 and don't bother with anything else. So much newer types have come on the market such as multi head coils and .15 ohm coils etc but Ive tried them but never felt the Cleito coils aren't enough... I use the .4ohm coils at about 47.5W. You can vape at 60W to but after 50W it's so decent you don't really need to go higher, well that's subjective I guess. I use 80VG liquid. They last a month easily. Great flavour, no leaks, fantastic build, good clouds and easy to fill and change coils. Also for a sub ohm they don't tear through liquid like crazy either.
I'd previously tried the Kangertech sub ohm tanks and they were rubbish, fidlesome and leaky.
The Innokin I-Sub V tank and .5ohm coils are also decent, don't ever leak and give good flavour. The coils and tank cost a little less and they are stylish tanks but Cleito flavour is better if you don't mind paying just a little more... They give a good vape at about 45W
I'm not a HUGE cloud chaser I just like a good nic buzz and immense flavour and a nice dense but not mega cloud with as little hassle as possible and the .4ohm coils have never made me feel I need more wattage or less ohms, though they do come in .2ohm also.... Easy to put coils in, easy to fill, never leak and amazing flavour. Really can't go wrong if you're into 'plug-and-play' - ie not rebuilding etc. Still big clouds but not the type you see on youtube to do cloud tricks with etc, but still very good ammount of vapour...
Never had one dry hit or leak - ever.
The ISub V is good if you want to save a little each purchase with as good life and build quality, a reliable system which I still use as the tank came free with my mod, so why not still us eit for my second or third flavour (always best to have a couple of or a few tanks with different flavours in.)
I could never go back to Nautilus type tanks now, these sub ohm tanks above are so good and an excellent introduction to sub ohm vaping.