I know Gundam Seed Destiny is still running, so you haven't seen all the episodes yet; but as a big Seed and Seed Destiny fan, I'm curious to find out which episode until now you liked most.
Mine's ep. 13, where Kira decides to pilot Freedom again to protect his friends and the ones he loves. Ep. 34 is
also a very good episode, although after seeing it I almost didn't sleep for an entire week, not knowing if Kira
had survided the spectacular battle with Shinn. But he did; "you're the best Kira !!!" ^_^