It's been my expercience that females are hard to find. They also do not have any color. You can mix males of diff species, but not males and females. All of the Dwarfs, ie powder blue, regular dwarf, flame, sunset, etc. are all just color variations of the dwarf species. honey Dwarfs are a different species, and then all of the rest are regular gouramis, meaning not dwarfs).
I bought some females that were listed as dwarfs. When I got home I found out they were honey dwarfs, so i went and got a few male honeys. Well, now some of my females are getting colors. I now have learned that in honey dwarfs, males can loose their color and look like females when they are subdominant. So, now I am waiting to see if I have any females. With Pearl Gouramis I know its hard to tell them apart until they mature and you will find females and males in the stores quite often.
I would do your research about males and females. B/c most LFS employees won't know. That's how I got stuck in my situation. Luckily I have a 120 and a 40 that I just set up, so if they start to fight I can seperate them a bit. But I am hoping the 120 will give them enough room. Personally, I think getting 2 males and no females would be fine too. Maybe then you could get a couple of differsent species. They will still establish territories and build bubble nests.
Anyway, good luck. Gouramis have to be one of my favs.