What Breed Are These Black Beauties

[JDchicks]

I got 4 new chicks today.

Could anyone tell me what breed they may be...
Stripes down back

Stripes down back

Has a solid white butt

Has black butt

 

[donrae]

I think your top chicks are silver laced Wyandottes, but will bow to someone who's had them as chicks more recently....it's been a while since I've seen them as chicks!

The second set look to be barred Rocks.