It sounds to me like you have the basics already covered. Just buy new, more specific, tools as the need arises. After all, we could sit here all day and come up with a list a mile long as to what the "basic" tools to have should be. For example, I consider a pedal wrench to be a "basic" tool, while someone else would say, it's over kill, and you can get away with using a 15mm box end wrench. So, again, just buy what you need as the need arises.

However, having said all that, it might not be a bad idea to get a tire pump.