CK and Capital One's tool are much more sensitive to changes, from what I've seen.
As far as Discover and Amex, both are good banks that do offer chances to grow quickly. Look at the benefits you like of each card to figure out what you want to go for in the future. Neither would be a bad choice
Thanks for the info, I will take a 40-50 point jump in one month anytime. With reading your signature thats the average number I came up with.