I agree with SableSteel! The buck shows promise in his conformation, but it's definitely too early to tell for sure now. However, you could purchase him now, and watch him grow out for a couple months! At that point, if you feel he's not a benefit to your herd, you can find him the perfect pet home. Keep in mind they may take up to 4-6 months to get out of their 'uglies' stage. If that's something you don't feel interested in doing, I'd look out for an older, maybe proven buck. Make sure you find one that complements your does flaws. Although she's definitely lacking in type, you could work towards it with a buck that's got nice ear/crown placement, and a big chunky head with a lot of width. Don't be scared to just buy a black tort! They're common, but the pet world doesn't know it! And a large majority have good type and good lines.
I think your doe is a beautiful color for pet breeding! I believe she is a chocolate harlequin, although she could be a just a lighter black harlequin. Time will tell for sure on that! And I'm glad you're working towards type, that's something I wish I had started with as a pet breeder. Sometimes the colors are too much to resist! Good luck