The loaches, guppies and neons should all get along. The gouramies you listed are both varieties of the same species - colisa lalia - the dwarf gourami. In a relatively large tank like yours, you could easily keep 2 males without problems. They shouldn't bother your other fish either - just each other. However, I would preffer that you got a male and 2 females or 2 males and 4 females. I wouldn't put dwarfs with any other species of gourami. I also have to disagree about keeping larger gouramies together. You should only keep one male blue/three-spot/opaline/gold gourami per tank (unless it's a large tank, planted and with lots of females). You can keep several females though and a male with several females. I know other people have had different experiences but I would say these fish are more suited to a tank with slightly more aggressive species and I've had several kill off my dwarf gouramies... Moonlight gouramies are more peaceful but larger so you could only keep a few. The males can also be territorial (like other gouramies). Pearl gouramies are beautiful and peaceful (IME) and I would highly reccomend them for your tank. However, I would suggest a male and 1 or 2 females (though it doesn't realy matter as long as the males don't out-number the females) and you could still try keeping the dwarfs though it all depends on the individual fish as some are more aggressive than others (gouramies are such characters...). Three-spot/blue/opaline/gold gouramies are all the same species. You can mix one of these with a moonlight and a pearl but I would suggest only getting a male pearl and keeping the rest female.
I would also suggest switching the neons for black phantoms or harlequin rasboras as they can be quite fragile and don't have as much character as phantoms or shoal as well as the rasboras. Golden dwarf barbs are also wonderful and pretty (IMO). You may also want to consider platies instead of guppies as they are less likely to be harassed and are livelier (than male guppies at least). Also, without the guppies, you could get zebra danios which are remarkable fish... no matter what you might hear. They are absloutely beautiful, very active, have characters and there are several varieties (the long-finned ones are stunning).
