Premiere has an elements package which you can get with Photoshop elements for about £70
FCP/FCE are the ones i'd go with if you have a mac, Premiere if you are on Windows.
its also an idea to have a think about what you're going to film with(cameras/lighting). Nothing worse than trying to make shit footage look good. Be prepared to do some test shooting, making a recce if its an external shoot at the same time and day you may be shooting. i made a film once in a kids playground and when we got there the North west model boat society were having a grand prix on the boating lake next door!!! we managed to persuade them to give us two hours to get all our dialogue stuff done, nightmare shoot!