I have 6 bredas, and really like them too! I'd love to see pictures of yours, I think mine are around the same age. I have no idea how to sex them yet. Most of mine are developing crests right now.
I have 2 that are silver. But they never had that dark splotch on them like your silver chick has. I didn't even know there was a splash breda! We'll see I guess!