reaper.
REAPER | About
it will handle the little task of what you are doing and if you want to do stuff in the future(edit home movies/car movies with sound, record yourself playing guitar/singing/etc., hell multi-track record a band) it will do anything you need.
it might not be the easiest program ill give you that but it has a manual and what you are trying to do is simple enough. i know it looks daunting but it is pretty much self explanatory.
