Thanks to all the replies.
I also got to try the 505c and the 930t at the Orleans demo over the weekend but somehow I missed the 715a, which I regret because that was a reaction that I was looking for, and I liked how the track balls rolled for me.
I did also buy a Hammer Jigsaw which I LOVE btw, and I took 4th in the tournament on Sunday with it, so I was pretty happy about that.
I'm really thinking about going with the 715 then...