None of those will make sexlinks with your Cream Legbar rooster.
But if you don't want to buy more chicks, you can use some of your current hens to produce daughters that will have auto-sexing chicks the next year.
Hatch eggs from your current black hens. All the chicks will have white...
At least in theory, Cream Legbars should be homozygous for gold, but have a gene that dilutes the gold to cream.
In practice, I've read that some "Cream Lebars" actually have the silver gene.
So it would come down to what your specific rooster has. You might be able to do some test-hatches...
You could deliberately pick some hens that will give distinctive chicks, so you can tell which are which.
For example, Brahmas will produce chicks with pea combs and feathered feet.
With your rooster, Bielefelders will produce chicks about the same color as Cream Legbars but they will probably...
Yes, it definitely tends to be cheaper to experiment with what is avaliable locally :)
Some meat birds grow fast (many of the dual purpose breeds were originally bred to do this). Some other meat birds grow slowly but eventually reach a much larger adult size (Brahmas and Jersey Giants are...
No first-hand experience, but from what I have read, the barring gene should behave the same in any breed.
Barring obviously looks a little different depending on what color the rest of the chicken is (Legbar vs. Barred Rock vs. Delaware) But the same basic idea should work for all the crosses...