It's going to be somewhat by guess and by god, but the overriding principle should be the directories (free or paid) that already have the appropriate category for you -- which is perhaps something on the lines of woodworking tools (although this is quite likely to be a subcategory rather than a main one).
In addition, you want to find the directories that presently feature sites similar to yours, including (it needs to be said) those put together by your competitors.
All told, your objective is to find the directory sites that are most likely to turn up when someone searches for routers or whatever other keywords/phrases your potential customers are most likely to use.
In other words, you should focus on the bang more than the buck. Your goal should be to attract the right kind of visitors -- and money isn't going to be the deciding issue, nor should it be.
Duncan
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