I started raising a few goats about a year ago to mainly keep the grass down in my pasture. The best parasite resistant goat to get will be a Kiko, Spanish, or a cross breed of one of the two. First four goats we got we had a terrible time with worms. Lost 3 of those. Still have one of the first ones and now two others. I've got Kikos now and they seem to be doing good. Keep a check on the color of the inside of their lower eye lids and gums. They should be bright pink. Research the FAMACHA chart and you'll see what I'm talking about. They can build up a resistance to the wormer if given too often.
I also don't know if you want to get just males. Only a few of them can sometimes cause them to fight each other and they can kill one another. I'm quite sure that's what happened to one of my other billy's we first had. It might be better for you to just get nannies or nannies and one billy if you want to breed them.