That is horrible, dumping dogs. Can't imagine the stress involved in that. Sounds like you have a super duper plan. Keep us updated on that and your 'luck'. =)
Go with what you like, there is no breed/type of rooster on earth that is better than another. Just comes down to what the individual likes, i.e. colors, personalities. And trust me, out of the 15 sexed chicks you probably have a small handful of roosters already, it's not a perfected art form...