It figures that as I get my spellstrike hood made last week (after all of the grinding/farming), I go on a Kara run on Tuesday and get the T4 headpiece handed to me (everyone else had theirs). This makes a two-piece set bonus for me (no interruption on frostbolt/fireball) which I like a lot, although it puts out a little less damage than the spellstrike hood (I may need to re-calculate after I hadd in the 15spelldmg meta gem though).
On a side note, I do not have the spellstrike pants, so the bonus for that is moot.
Which would you go with?