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The Congo will make you rich once rubber kicks in. Sokoto, Ethiopia, Zulu, and the Nile Delta are good colonies because of the manpower reserves (soldiers) that can be built up in them.
 
Egypt is worth conquering as a route into central Africa and the Horn, plus it's got a decently large population. Libya is pretty useless but opens a possible route into Sokoto and West-Central Africa. Morocco, Algeria and Tunisia actually have a pretty good popultion and give you a masssive base to work from, but they are mostly reserved by France.