I would make both crosses but I think the best results would be from a checker doe and a NZ buck. Black NZ might be best but white will work, ya just dont know what color the white is, geneticly. It doesnt matter anyhow as you will retain the best typed individuals for your next breedings.
I can tell you, type will be a struggle for a few gens. My does havent had any checker in them for at least 6-7 gens and they for sure resemble a CG. heir all white litter mates looked more NZ in type. These does did give me some very nicely typed young bred to a white show type buck, I will breed them back to sire and my good broken NZ bvuck. Long shopulders seems to be the biggest fault but thats not a difficult trait to correct. just keep the loins nice and full.
The 1st couple breedings have the most noticable improvements, thwen some judicious inbreeding will set your type and lines can go from there.