Well that is a tough decision to make. First of all you have to think about a lot of things. Oscars, Jewels, texas, red devils, and the likes are a dime a dozen. There is no way you can compete with the large breeders who breed all these fish and sell to LFS. What you should do is find a exotic type cichlid such as a Dimidiochromis Compressiceps, 6 or 7 stripe Frontosa's, etc... These fish are more expensive to buy but will pay more out to the breeders. Below is a pic of a Dimidiochromis Compressiceps.
-S42K
