Tony,
Do you have any specs for the Align ESC? I have a rather bulky 30A ESC that I would like to replace and put the 30A in my upcoming 450. I am curious what the current rating and weight are.
Regarding gyros, I can highly recommend the Spartan Quark for a 250. It holds the tail very well with a JR-DS290G servo. They are pricey at $150, but very small, light weight, and quite responsive.