Just got my BP 5004 from Angus (Puretime) and it came with a crappy plastic strap (great watch though!) - no animals are harmed in the making of rep straps.
So just go ahead and buy a BP and budget for a top quality strap from anyone of the strappies on here or on repgeek... i've gone with vanilla gorilla (gorilla straps : http://www.flickr.com/photos/gorilla-straps/
Aviator in ostrich leather is the baby to go for!