I've just setup about a month ago a nano tank. Dymax IQ5 with a Dymax 30w heater and a Dymax Venturi Protein Skimmer. I got a lid made as HFF did not have any stock of the Dymax lid.
I've imported a couple of Cree PAR38 lights. One is 6x6 - 6 white and 6 blue. The other is 8x4.
The 8x4 is brighter and would be good for Acros. The other is a nice balance.
The tank comes with lights but is not strong enough for Marines.
Hard to say which I prefer as both are just as nice.
I've just this week added some Zoos. They seem to be enjoying the light.
I'm working out an auto top off as evaporation is faster on a nano, but has reduced since I put the lid on.
Definitely cheaper to run than bigger tanks, BUT you need to be more meticulous with maintenance.
I personally think top up water is the most important as the salinity will fluctuate greatly if a lot of water had evaporated.