What do I do??

You seem pretty mindset on it but if you're only getting rid of the already striking Lacy but if then go on to say you find dogs that are decent but not what you consider good. Does the lacy fall into this category for you or is his aggressiveness his only fault?? If his only fault is the aggressiveness I would keep him and get him snipped just to use to get your 7 month old puppy going. Which leads me to another question, If you only have 1 dog running right now and the rest are pups you must be running with friends packs?? Would they have any dogs that you've seen work for sale?

Any dog that you're gonna end up with is gonna need one thing to become a great dog and that is time on the job. Just a few random thoughts that popped into my head as I thought about what direction I would head in! Good luck!