I don't know if they have the right "personality," but the suggestion of larger rainbowfish is a good one. A mix of turquoise, axelrodi, bosemani, etc., would look stunning. Are you familiar with uaru cichlids? They aren't usually as tough on plants as other med-lg cichlids and are fairly peaceful (not as passive as discus, however), but still have that cichlid-style inquisitive/interactive personality. Festivum cichlids would be OK with most types of plants (although the one I had years ago used to bite holes in the Amazon swordplants--as do clown loaches).
"Roseline sharks" (actually denisoni barbs) would be awesome and much better than tinfoils in your tank. The downside is that they are expensive. Clown barbs would work, too. They get fairly large (but not 8") and color up beautifully. Tinfoil barbs will destroy all of your plants, besides being too big for your tank. Most barbs will do some plant munching, but on a much smaller scale.
Discus are probably the ultimate planted-tank inhabitants. Their reputation as being fragile and disease-prone is untrue if you start with good specimens (admittedly a challenge in some locales) and keep up with your maintenance. Years ago, I tried keeping wild-caught discus and had nothing but trouble. But I've had good luck with the tank-raised ones.
Giant gouramis--the ones that look sort of like dwarf gouramis on steroids (Colisa fasciata; NOT the monstrous Osphronemus gouramis)--would be good, as would pearl gouramis. Adult pearl gouramis are really beautiful. Moonlights or snakeskins would be OK, but I think they get kind of ungainly and ugly when full grown (8" or so).