I have a couple of tools I use rarely.
My Park spoke tension meter has been useful, although not as essential as I thought when I first bought it.
Also have a Stronglight crank puller that I paid $50 for two years ago. Haven't used it since, but it was very helpful in getting that crank off. At the time I couldn't find anyone who had one.
My reason for asking this is that I now need a headset press and an cup remover. But I'm more inclined to drag my frame down to the bike co-op and use theirs.