The 60 - 80 set is the right size range. However, a few things to watch. First of all, not all pin vises (in fact, very few, will chuck up the smallest drills (say 75-80). I had to buy a seperate one just for that size range. Second, the smaller sizes (say, 70 - 80) are very fragile. If you don't hold the pin vise at a uniform angle while drilling they break oh-so-easily. So figure small drills are a supply item that will need replenishment periodically. I bought a set with a nice plastic case, and when I have too many vacant cavities in the set I buy another set with a cheap case and just use it as a supply to replentish the ones missing in the nice case.
Another thing. Unless you have a good mike or accurate caliper, you cannot identify the size very easily, so when you take a drill out of the case, take only one at a time out, and replace it before you take the next one out. Otherwise you'll have them mis-assorted.