Sound FX & After Effects

I've just finished some filming for, potentially, the first of my PRP artefacts. There's a fair ammount of editing to be done, but the bare bones are there and I have a rough edit rendering at the moment. The film makes heavy use of After Effects, and I think so far it's probably the best work I've done with that programme.
I've been having a look around for various sound effects too, and have found quite a large ammount but with varying degrees of quality. I've been thinking about how different pieces of music can work here too, and thankfully this time I'm not restrained by copyright, as the film is not for commercial use, it's just to illustrate a point.