Well, i use Windows Movie Maker to do my videos, which is terrible, crashes on a regular basis, and usually involves me saving a lot of mini-files just so i can get the whole thing to work! But it's free, and i can't really afford anything good.
Oh, and i might warn ya: the first mv i'll do that'll have Matt Smith in it probably won't be focused on him. In fact, he'll probably only be in the last 20 seconds of what i've got planned. I've got a really good idea for a dr who mv to a weezer song that i just can't resist!