if you go onto www.cichlid-forum.com then there are profiles for almost all cichlids.
the rule that i would go by is 1" of fish per gal, then after 6months 2" of fish per gal at the very most.
i would personally look into tanganyikans there are a great range of fish from there
Kribs are really nice looking and easy to pair up and breed... Blue Rams... but then again they dont get big.... Unless u mean big as in breed alot so numbers get bigger... Good luck