A pair of Kribs in a Platy tank?

I've got a 40 Breeder tank that I'm cycling with Platies. My
intention was to put some corys in for the bottom, but my reading has
got me interested in Cichlids. Some questions:

Are Kribs a good choice for beginner cichlid? Rams were another that
were suggested to me, but from what I've read they are pickier about
the water and harder to breed. I would have considered Convicts (and
removed all the other fish), but I'd like to be able to get people to
take any young (maybe even trade them to the LFS) if I'm sucessful in
breeding.

Some people have talked about having Kribs in a tank with mollies,
with the mollies being banished to the top of the tank during
breeding. Would this work with platies as well, or should I move them
to another tank?

Other suggestions for tank mates?