Goggles,
Sounds like you have a nice upgrade in the works. Personally, I don't care for gouramis. I know lots of people like them. They have a reputation for aggression - of course, I have Malawi cichlids, so I don't have much room to talk

Tetras are nice for movement and a splash of color. I LOVE kuhli loaches and Zebra plecos are my dream fish. Be selective in your source for Zebras. My other fav fish is the bristlenose pleco, perfect for a mid-size aquarium. Watch out for common plecos, they get much too large for the tank you are planning.
I like rare, endangered fish and I like to try to breed fish.
Whatever fish you choose, make sure they can cohabitate and that they have similar water condition requirements. Filter well, feed good foods (but not too much), and don't overstock.
If you come up with a potential stocking list , post your choices here - Local Fish Stores don't always have well trained sales associates in their fish depts. People will give you input and help steer you away from a mistake.
Good luck