If you are starting out - get the express version. It's much less money and is easier to learn than the full-blown Final Cut Studio version.
This is the standard for Apple Users - if you are a serious this is the software for you. This software has a steep learning curve. Used by Professional film makers.
Recommended VIDEO Editing Software for Windows PC's
A highly recommend software for Windows users. It's powerful yet not difficult to use. Full of features for the price.
If you are a beginner and want an easy to learn plus fun package - this is it. Great for schools and kids. If you just want the basics and don't want to spend hours reading a manual this is for you.