There are more than five of us man, c'mon!
All joking aside (at least I hope you were joking) I'd wait for SP Authentic to come out. I've never like Black Diamond, and let's face it, panini is crap. SPA seems to deliver every year, and this year has had a pretty solid crop of rookies, so it'd be a good product to buy.
I will leave my signature the same until the Toronto Maple Leafs win the Stanley Cup. In short, I will never change my signature.