The real answer is that if you dont know what's out there you probably don't do anything nearly complex enough to make it worth buying a pro package. If all you are doing is cutting and pasting clips and adding music you can use anything! The one big advantage of pro software is that you have many options to export, but this can also be a big learning curve and most likely all you need is a preset for vimeo or youtube HD, which most include. Most of us with pro software still only use the basic functions that the free packages include, after all 99% of what we are doing is trimming fat off a clip and re-organizing them and then adding music.