Where I live there isn't much to choose from in the local fish stores either and what is available is in mixed african tanks so you have to find out what they are after you buy them. Well, I guess you could take a pic of them in the store and go home to find out what they are (pain in the rear). If you're lucky you might find a store that will let you return fish (hard to do once you get attached lol).
Anyway, xbottenx, you probably should figure out what fish you have before adding more. Like Kim said, even the ones you have might not be compatible let alone adding ones from different lakes. I'm not saying it can't be done & hope I'm not sounding like a smart alec. Just trying to be helpful (I'm pretty new to fish keeping and trying to learn myself). I looked in the unidentified section to see if you posted pics. For some reasons the links you posted won't work for me

. Someone identified them as possibly being...
1. Metriaclima lombardoi (kenyi)
These can be a pretty mean fish and it's recommended to have even MORE than 3-4 females per male of them. Sexing of them should be easier than some species though. The females are a light blueish color with black stripes and the males are yellow with brown stripes and eventually lose the stripes and turn all yellow. Males do look like females when they are born but I think they get their male color pretty early. I hope someone corrects me if I'm wrong. I'm just going by the two little ones I bought.
2. Metriaclima Greshakei
I don't have any of these but you can check them out in the profile section. I don't think they're overly mean. I don't know about sexing them either.
3. Labidochromis caeruleus (yellow lab)
They are a nice mellow fish as far as cichlids go and the sex of them isn't so important unless you're wanting to breed them.
4. Melanochromis auratus
A real pretty fish but can get very MEAN. I bought 3 small ones and they were fine until 2 of them started turning male colored (loosing some of the yellow and white and turning mostly black). I had to take the one male out and put him in another tank to grow his tail back before I return him to the store. 2 males won't get along in the same tank unless it's a really really huge tank. I was lucky it wasn't worse with mine. I've heard they can be real killing machines.
5. Copadichromis borleyi
I have one of these I bought from Walmart (didn't know what it was when I got it). I've read that they like to be in groups so I'd like to get some more when my bigger tank comes through. It does try to swim with my acei so I believe they are a skoaling sp? (schooling) fish. They are a carnivore where the others aren't but if you feed New Life Spectrum food it's good for all of them. They are a peaceful fish though even if they are carnivores. I'm not sure about sexing them. Mine is brown with rusty orange fins and tail. I think the males turn kinda blue but I don't know at what size. If I remember right, I think they get to be 8".
You said you have 2 orange labs? Like Kim said, that sounds like it could be Metriaclima estherae (red zebras) but nobody mentioned them from looking at your pics so maybe they are the M. greshakei?
I hope this has been some help. Trying to keep cichlids can get overwelming when you get alot of info thrown at you all at once but take your time and try to learn what you can about them. Almost any of them will get along ok while they are small as long as the water and food is right for them. You have a nice size tank for cichlids too so enjoy your fish and the hobby. It's wayyyyyy fun lol. :fish: