Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › What video editing program is the good yet easy to learn › Pinnacle studios recently
Pinnacle studios recently came out with Studio 10, which features chroma-key and many other effects, and is very easy to use, and very cheap. However, like what Rick said, it is not a professional NLE, and be warned, a fair amount of their more complex effects/filters/transitions, you have to pay extra online.
If you have a mac, I would recommend Final Cut Express. It can easily take care of all the effects you want to do and much more, for $299, or less with an academic discount.
Nonetheless, follow everyone’s advice: check out the trials and find out what you like.