Likewise. Like you, I started with a nano...about 2 months ago--an 8 gallon Fluval EBI originally designed for shrimp, but has rounded front corners like a biocube.
In the past 2 months I've bought a 29 gal biocube, 25 gal rimless cube, and today a 26 gallon c-vue from Cobalt showed up on my doorstep... this hobby tends to suck you in, when you go "just a little bigger"....then justify getting a different light, skimmer, blah blah.
At least you've started with a 16. I think that's a better starting point than I had.
Since lighting typically costs more than the tank...I started with an Aquaknight A029, then a wifi black box, AI prime HD, and finally just sucked it up and bought a Hydra 26, make sure the 16 is something you're comfortable keeping around because buyers remorse is more expensive if you have to upgrade your lighting for the next tank.