A good source for information about video editing software is HV20 forum
. The forum covers a lot more than the Canon HV20/30 camcorders. You'll find discussions of both PC and MAC editing software and hardware.
Magix's Movie Edit Pro 16 Plus (be sure to get the plus version and if possible get the boxed not the download version) Magix's website
is another good low cost video editor (about $90). Best Buy often has it for less than that.
All video editing software can be frustrating to use (more so than photo editing software) but if you stick with it and take advantage of the online forums you can get past your problems and have lots of fun.
Unless you have pro desires, you should be able to do everything you want with any of these:
Movie Edit Pro 16 Plus website
Sony Vegas Movie Studio HD Platinum Website
Sony Vegas Movie Studio HD Platinum 10 Production Suite Website
Adobe Premiere Elements 8 Website
(now at $30 off)
You can download trial versions of these and see which you like.
All these companies have higher priced pro versions if you decide you need more.
Microsoft's free Movie Make for Vista/Windows 7 Website
is a simple free alternative. I'm not sure if it supports your camera but you can start with it and then see if you want to move on.