"Kate" is the most similar to my male name that I can think of. It also allows me to keep my initials, and I can write it fairly well.
Plus, I kinda have crushes on Kate Beckinsale (as the Underworld vamp) and Cate Blanchett (especially as Galadriel).
And strangely, I kinda like that it's not particularly feminine or soft sounding. Yea, I know, weird thing for a m2f to say...