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Technically speaking, there's no straight horizon on a round planet
I don't know of any profiles that can fix that, but the adaptive wide angle filter in CS6 lets you straighten just about any bent line with a little mouse clicking
If you are asking what we are using to correct lens distortion, I use the plugin I linked to 4 posts above yours. There are others linked in this thread, and there is PTLens, which works really well, but isn't free.
Thanks will give the Wide angle filter a go