I liked your idea up further in the thread with the two types of rasboras and the corys. I was going to suggest harlequins because they go great in a tank that size and they're a schooling fish. You'd definitely have to have that tank finished cycling though because they are sensitive to water conditions.
No matter what you decide, I would definitely stick to one or two schools of fish. Your school will be much more impressive and make the tank more attractive...plus you can design it around the needs of one or two types of fish instead of 6 different kinds.
If it were my tank out of the choices you just listed I'd pick 5 Harlequin Rasboras, 5 peppered cories and if you have to have a gourami then the gourami. If you didn't get the gourami I'd get another cory and a couple more harlies.
No matter what you decide, I would definitely stick to one or two schools of fish. Your school will be much more impressive and make the tank more attractive...plus you can design it around the needs of one or two types of fish instead of 6 different kinds.
If it were my tank out of the choices you just listed I'd pick 5 Harlequin Rasboras, 5 peppered cories and if you have to have a gourami then the gourami. If you didn't get the gourami I'd get another cory and a couple more harlies.