I've only ever corrupted a SE once, it was because I was doing an unofficial (read "Probably illegal") manual flash over a DCU-60 cable.
I just got a K850i for free on a contract - it's a pretty sturdy piece.
My dad insists on getting Samsung phones, and from using his two, I don't like them. I've not played with the F700, but the one he has is total useless.