Certainly worth investing in some fret levelling and crowning files then! The crowning files come in various fret widths, so unless you go and buy a mixed set, it's worth measuring your guitars for their fret widths and seeing what they use. You may never need the very thin ones (unless you are working on some vintage instruments or maybe small instruments like a mandolin.

I've built up quite a collection of luthier type tools over the past 18 months, some more used than others, but all are useful if you've got that particular job to do!