Almost there:
1) Record in 1080 60p.
2) Convert to ProRes 422 in ClipWrap.
3) Import files in FCP X as 1080 60p, not 1080 30i.
FCP X can edit 1080 60p effortlessly. However, as many others are quick to point out, you can't (currently) do much with 60fps as far as exports (i.e. internet upload sites will require you to convert to 29.97 fps, burning a DVD requires frame rate change, etc.). Maybe I'm foolish to use 60 fps at all considering the fact that I have to convert later, but my logic is this:
1) My camera records at its highest quality at 1080 60p --why record anything less than highest quality?
2) Eventually the world might allow for different frame rates, and my projects will all be readily available to export at 60 (59.94) fps so I can finally share them the way they were meant to be seen. In the meantime, however, taking the extra step to convert to 30 (29.97) fps is not a big deal.
I hope this helps. It's been working for me. I probably wouldn't shoot a feature film in 60 fps --not because it is inherently worse-- but simply because the world is used to 24 / 25 fps. But for everything else I do this frame rate works wonderfully (except having to render twice the frames in Motion when doing motion graphics).