what type of gouramis were you thinking? gold and blue can get aggressive, I have one gold male and he bullies my 2 angels sometimes, he is definitely the dominant one in the tank
german blue rams can be sensitive and some have trouble keeping them, I had two a male and female. the male lived a year and a half then died, he grew very pale and stopped eating and I dont know why. The female disappeared recently and I havent found a body. She was 2 but looked in good health.
I suggest 1, 2, or 5/6+ angels. 1 solo, 2 as a mating pair or 5/6+ to spread out aggression. I learned from experience on that.. what type of angels? scalare? I think some gold or platinum or silver angels would look very pretty (not veiltail, not sure if the tetras will pick on their fins, never had them)
As for plecos, Im not sure, but I prefer otos.
Are you set on these fish or are you open to suggestions? Hehe.
Any more ideas on which plants? I found my angels like to eat and tear up wisteria and christmas moss and found parts floating all over. Not good for an aesthetic look.
You can try looking here for some ideas on plants
http/www.plantgeek.net/plantguide.php
http/www.tropica.com/default.asp
Very nice so far though, can't wait to see it finished !