level of discounts vary but i can tell you that the 15450 is not hard to find in the UK and we have a serious AP shortage, so even here I imagine a decent discount is obtainable. I saw 3 in an AD's window on Thursday. 15400's dont sit in the AD's window very long before those are snatched up. Being midsize it cuts into the demand vs the 15400. Good thing for you though.
I think the silver dial is the best, but its just a matter of preference as there isnt a bad choice.