I suggest the purchasable version of GameCam. It's a fantastic video capturing program. I used it when I recorded my PvP on WoW.
You get a fantastic quality picture with no 'GameCam' watermark or anything, and it doesn't destroy your framerate ingame like Fraps can. And it's simple to use which always helps. Try it, you won't be dissapointed.
Oh, and converting your files, i highly reccomend adobe premier, although it's a tad more expensive.
And if you're wondering what the quality is like, put it this way, you could read the combat log and general chat log in WoW no problem.