Hi JohnnyTK,
I have had good luck with Nicholson files. Recently I purchased a couple file handles from Canadian Tire that clamp onto the file - so far they are really good.
I have a few Princess Auto files that perform well for brass and aluminium....not as great on harder metals
The other posts here suggest some file brands, but here's a discussion about handles you might be interested in too........any suggestions of brands would be appreciated?