Video editing program (OSX)

Hi,

I've been into photography for some time now and wanted to try something related but somehow different so video seemed like a good thing.

I'm looking for a soft that could make me edit videos, add music to it, and so on. I mostly do timelapses and record shorts videos with a GoPro and a DSLR.

However, I'm just starting and I'm not quite into flushing outright a lot of money for Final Cut Pro X or equivalent, as with my studies I'll have next year some reductions for those programs. So if you have some advice about a good soft which is free or less than 40-50$, I'm waiting for your comments !

Thanks a lot.

PS: I'm on OSX.