You cannot mix gourami usually though you have space for careful mixing of maybe two species......
AS far as dwarf gourami...they are either colisa chuna/sota or colisa lalia. Chuna has two morphs which one has been renamed (it WAS a MADE fish in 1972...no matter how many got released into the wild later). Lalia is a real lil pistol and should NOT be mixed with any other labyrinth . If they fear their tankmates they will hide in a corner and die or if the tankmate is a labyrinth/same body..they'll harasss it to death. They tear each other up almost as bad as betta and the male will harrass an unwilling female to stress or shred her. The Two-spot and three spot morphs also are iffy community fish and are not fond of other gourami types.
With all these fish it is a case of One male or 3-5 mixed.
If you want large gourami, they are peaceful types available. But the peaceful comes from a schooling nature so they don't do well in numbers less than 4-5. You can mix T/leeri(4 color morphs) and Kissers (2 colors) and even a trio snakeskins. Small tank mates may be lunch but they won't harrasss anything. These are all fish that grow 6-8 inches.
Nippers like angels are not good with gourami because the specialized feelers. These are tempting targets and are needed as organs of touch, taste and hearing. Though they do grow back, if there are any other stress factors in the community, this can cause them to fade away like a runt kitten. It is especially important to the dwarf gourami because they add an extra duty of hormone emmitting.
You can mix many color morphs of one specie, ,but I would caution against hoping for exceptions to the rule and mixing several species.
With the large gentle types you can have one docile betta splendens to patrol your tank....though sometimes they take exception to platies and mollys for the finnage and similar shape/colors.
Maybe you should go Asian community tank (biotope) instead of SA if you really like gourami.
Rasboras are asian, nearly all loaches are...and there are colorful smaller loaches to grab a trio + of.
Hope this helps