IM going with BSL too. look here
http://2.bp.blogspot.com/_b_LWsdjxDUI/TT52j6UdBHI/AAAAAAAAE1Y/zYEO-ekFb2U/s400/black+sex-link+chicks.jpg
I have 7 of these girls. Mine are about 7-8 weeks old. They have nice personalities & are supposed to be excellent layers, starting as early as 16 weeks.