Starting out with a single gene male for your first project isn't the worst way to start. It just does make things a bit slower if you want to build up to bigger projects. I was on my way to doing something similar, but while still waiting on my female to get to size, I ended up finding a great male to cross with her. Opps....
Of course, you will have to keep in mind that the market is a bit flooded with new breeders at the moment...and while that definitely can help with finding a snake for your projects, keep in mind that you will also have to compete when finding homes for your little ones. There can also be the occasional breeding issues as you go on. For example one of my current snakes is a rehome from a breeder who had an incubator fail, so he has a kink.
Piebald is a pretty healthy gene, but some other genes can lead to birth defects or neurological issues. OWAL has a pretty good list of possible issues here: https://www.owalreptiles.com/issues.php
And now that that's been said....
An adult female of size will of course run you more than a younger hatchling. But honestly all of the genes you mentioned are some great genes to look into for a pied project. They're bright and fun combos for sure. Enchi or coral glow/banana might also be a nice one to add in to that mix. I would try to make sure whatever female you do pick up is het for pied, that way you get a 50% ratio of pieds and het pieds on top of what was mentioned.
Another option might be looking for something else that's recessive, like an Albino, Hypo/Orange ghost or Desert Ghost that is het for pied. That can bring in some other possibilities for colors. Everything would be either a pied het for 'x' or double het.