Honey Gouramis are a dwarf gourami. In Australia we call them Honey Dwarf Gouramis. If you want dwarf (small) gouramis, then stay with Honey Dwarf Gourami, which are the fish in the pictures you posted above.
Do not get the normal Dwarf Gouramis (Trichogaster lalius) or any of their colour forms. If you google Trichogaster lalius and look at images of them, you will see a wide range of normal dwarf gourami colour forms. You should avoid all of these colour forms because they all carry the same diseases, namely Tuberculosis (TB) and the Iridovirus.
The Honey Gouramis do not normally carry these diseases.
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A tank suitable for 1 pr of Honey Gouramis would be about 2ft long x 12inches wide x 12inches high. Or a similar size to that.
If you wanted 2 breeding prs, then you want a tank about 3 ft long x 12inches wide x 12 inches high or bigger. Preferably wider and higher (3ft x 18inch x 18inch) makes a nice size tank