I'm not a breeder (yet), but agree with the others. Get what YOU like. If there's someting you like but can't afford, get the ingredients to make it. If you want multi-gene animals males generally run cheaper than females, but if you want to spend the money on females, go for it! As for ratios... some may say keep more females than males because males can breed more than females, and that's true. But again, go for what you like and what will work for your plans.