Here is what I would like to see at more LFS.
-Mopani and Manzanita driftwood in a wide range of sizes
-quality filters, including sponge filters
-a variety of healthy plants
-various rock for hardscapes
and for fish
-Dario dario (of course)
-Badis badis
-Pseudomugils
-sparkling, licorice, and (if possible) chocolate gouramis
-killies
-dwarf crays
-pygmy cories
-Hara jerdoni
-Boraras, Microrasboras, and other nano fish
-CPDs
-Rasbora sarawakensis
-Rummynose rasboras
-some of the more unusual barbs, like filaments and odessas
-wild livebearers (platies, swordtail, and mollies)
-Goodeids
-halfbeaks
-Exodon paradoxus
-Stiphodon gobies
-smaller knifefish (African browns and centipedes)
-puffers
-payara
-polypterus
-wild bettas
Basically, anything that makes you do a double take and say WTF or "WOW!"
I cannot emphasis how much I would love to see wild variety livebearers. They will breed in the tank, and they're just as beautiful as the captive varieties. Girardinus metallicus would sell, size of guppies and beautifully colored.