haha! I was the one who posted the second breast collar.
I understand the purple craze. It's my color too. I wish I had a use for that breast collar, as it would be mine within seconds because it's soo bright. I also have the same saddle pad as you and I think it would match well to it. Also, sometimes it's good to get something a little bit "too bright" it stands out and you get tons of compliments on it. I definitely think you should go with the second one, as it's going to be very vibrant and I think you will be happy with the brightness and just how much it stands out-especially against that buckskin.