Dwarf gouramies (Colisa lalia) are disease-prone and so should not be kept in tanks where they might be stressed by active fish such as danios. Also, keep in mind that most of the 'common' gourami species are top-dwelling and so would compete with danios for space. A single male is otherwise theoretically fine since they are territorial fish.
A pair, BTW, is not reccomended. The consequence of keeping a pair of gouramies is that one bullies the other - not only in a mixed-sex pair, BTW. Even 2 females is risky and I'd always go for 3 at least though 4 or more is best.
A single male honey would be alright in your tank but not much of a 'centerpiece' until they develop breeding coloration. The same applies to croaking gouramies (Trichopsis vittatus mentioned above) as they are generally shy and not as brightly colored.
I would go with the poster earlier who suggested an entirely different species would be a better option but might I suggest an american-flag fish? The males are very colorful and grow to about 3". They are also quite hardy and will not hide once settled in. They can also be kept in large groups with several females and one male but avoid putting several males together or keeping them in smaller groups. While they usually ignore other species, they can be pretty aggressive towards conspecifics.
Another option would be a trio of cherry barbs. The males are very brightly colored. Unlike many other barbs, these are not schooling fish so make ideal 'centerpiece' types. They are also very active which fits in well with the rest of your stock. Similarly, a swordtail or trio of platies might be a consideration. It is easy to overlook these common fish but they do make nice centerpieces in a small tank like yours.
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