Number 8 is for the spark plugs I believe. My advice is to make sure you get oem honda tools. the philips drivers are neat because they are JIS standard and really lock into the screws well. The slot in the middle of number 3 locks into the back of the screwdriver bits 8,9,10 and makes them an awesome t-handle set.
My method is to try and work on the bike only using what's in my tool kit for most regular maintenance. The idea is that if you can do everything with the kit then there is nothing you can't repair on the side of the road. This isn't always practical of course but a little bit of logic will help you put together the tools you need.