AVS Video Editor isn't too bad. Takes a little while to get used to, just have fool around with it. It has a few more options than what Movie Maker has. I have been using the free version for the past 3 years.
I use PowerDirector for all of my YouTube vids. I think I paid $50 for the software and I really like it. The interface is pretty easy to learn and I havent even scratched the surface on what the program is capable of doing. Plus, being a popular application, you can find a lot of 'How-To' vids online.
I used to use Movie Maker the majority of the time. I also had VideoPad to do some of the more detailed stuff (slo-mo). This year my employer upgraded their Adobe package to the Creative Cloud. I now have access to Premier Pro. I used Premier 9 in college so I have some re-teaching and learning to do. So far I am impressed with what the program is capable of. It is definitely a high end program and is pretty costly. Something I would have never considered on my own.