That's right, alli and Moose. I've had both gouramis and rainbows, and they do tend to favor the upmost part of the tank. Though I find the rainbows venture downwards more...
Moose, my honest feeling nowadays is if you've got a nice sized tank, go with a super rainbowfish blowout tank. Go all the way--get several species, and then fill in other tank niches with cories and otos/plecs. If you've got rinbows, I'd leave out the rams and go for the profusion of colors that these guys have.
IMO, some Boesmani Rainbows are always a good centerpiece to the tank, and will continue to impress/inspire you, as males display for the females constantly. A good second species would be Praecox rainbows (I've now got both). A third species would be (go all out here) the Millenium Rainbowfish from rarefishatlax on
www.aquabid.com in the rainbowfish section. Another option would be celebes or threadfin rainbows. I could keep on suggesting, but I recommend you check out what rarefishatlax has before deciding for sure. He has some neat species.
Good luck!!! Go rainbowfish!