It would be the tank I have in my Living Room now. A 75g, planted, community tank. Right now I have 10 dwarf neon rainbowfish, 6 or 7 neon tetras, 6 glolight tetras, 6 corydoras, a bristlenose pleco, and a Yoyo loach along with some small snails that volunteered from either LRB or Steenfott when I ordered fish from them.
This tank is always a work in progress - which is what I love about community tanks. Right now I have what pleases me as far as small schooling fish are concerned and I'm considering what I'd like to add. It took me 2 years to decide on the dwarf neon rainbowfish and find the right source for the right price, so I'm in no hurry. I'm leaning toward 3 , five to six inch fish, possibly Pearl Gourami - but I'm still researching.
I like the size: large enough for lots of variety, but not so large that it demands all of the focus in the room.