[Killietalk] new to killies

[the insect queen <scarab at charter_net>]

I am an experienced aquarist and I've recently become interested in raising 
killifish. I would like to do a "permanent set-up" tank, probably a 10 
gallon, with a pair of killies. I am hoping for an especially 
ostentatiously colored fish. I liked one of the Aphyosemion australe photos 
from the AKA website (link below). Why is this fish so much different than 
some of the other photos I've seen of the same species? I like the very 
rainbow-hued one... but another was mostly orange and another one was all 
blues and greens.

http://www.aka.org/pages/Gallery/gallery_images/aphyosemion/austral2.gif

So my questions are:

1.) Why do different photos of this fish look so different, how do I obtain 
the ones that are multicolored and brilliant? It was listed as a "wild 
chocolate" one.
2.) Are there other good beginner killies that are this brightly colored 
and if so what are they?
3.) Does anyone have any good links for a beginner on how to take care of 
them? I've already read a lot but the more info the better.
4.) What is the best way to find and purchase specific killifish species?

Thanks for any info!

-Dahlia