Is there such thing as a board that holds a good edge on ice? That is more a mechanic of the ice than the board.
I have exactly the board you are looking at, it does pretty much everything well. The only other board I would consider getting at this stage (Given I am locked into Burton because of ICS) is a malolo, and that wouldn't replace my custom. It would be just for powder days.
i picked up a 2009 custom x last month for 280.00. I am told it should work a little better on ice because A) its stiffer and B) the X has PDE (pressure distribution edge).. similar to magnatraction. I havent tried it yet, nor can i comment on magnatraction.. but i hear it actually helps. I looked closely at the malolo but decided to get a Fish Ltd for pow days.