Hey mate,
What style of tank are you looking at? This can change some of these decisions slightly. A 60L is small enough that you can get away without a hob at all if you wanted to it just increases maintenance very slightly.
The main thing with small tanks is keeping the water stable and evaporation is the main thing to throw out Nanos due to the already small water volume. I would recommend a good automatic top off system for evaporation over getting a Hob as this will keep things much lower maintenance for you as far as stability goes.
For filtration your rock will be enough to take up nutrients and then just do small water change's each week and when you syphon out the water make sure to "surface skim" any build up of protein on the surface. I maintained a 60L like this for a few years no problems.