It's really up to you. What are your wants? What do you want to produce?
You can throw in a Pinstripe though to get some Kingpins if you want. Or a Cinnamon to get a Pewter. It's really more about what you are aiming for though. I advise against breeding solely for financial reason. You'll get burned out quick.
It never hurts to have a normal female though.
And welcome aboard!