I will do some research on each of the fish you have suggested. So far, I like the sound of either rams or dwarf gouramis. My LFS had some gorgeous German Gold Rams the last time I went in. They also had some Roseline Sharks, but I'm not sure those would be happy in my tank.
Rams tend to be really sensitive and short lived. I would veer towered the gouramis. There's also apistogramma, another dwarf cichlid. The "rose line sharks" are actually a large barb from India that grow to 6"+. Puntius denisonii.
The tank has a footprint of 24 inches long by 12-13 inches (it's a bow-front), and is about 18 inches deep. I know a longer rather than deeper one would have given me more options, but I just don't have the floor space.
Deep tanks are great. It does limit you a bit on some of the more active schooling fish that need more room.
I don't think plecos are really my thing, although the LFS did have one called an "Orange Seam" pleco that looked kind-of cool. They also had one called a "Burmese Pleco" that looked interesting, but it looked more like a loach to me.
Be careful with plecos, that cool looking pleco at the LFS could turn out to be a giant. Research species first. Bristle nose are a great first pleco and stay small.
I do really enjoy the two loaches that I have in my 10-gallon tank, so maybe I should try a new kind of loach? Problem is, there are so many kinds that it gets overwhelming! (Polka-dot, horse-face, black kuhli, golden dojo, panther, zebra, red-tailed, and yo-yo loaches?) Besides, I'm not sure the loaches in my LFS are all labelled correctly. Neither of my current ones were! Also, I don't know which loaches are overly aggressive, which ones absolutely require being kept in large groups, etc.
Stick with groups (at least 5) of smaller Botia loaches like yoyos, polka dots, or zebras. Kuhlis are anther option, but expect to see them less.
I'm actually having second thoughts about putting neons in the tank. I really liked the idea of having a school of them, but I'm reading that they need slightly acid water, and I'm guessing that our local water is alkaline (this being the desert and all).
You can forget the rams then. Much more sensitive to ph than most of the tetras you'll find. Most tetras are captive bred and not so picky about their ph as long as it's consistent.