Flush that brake fluid. :)
I wouldn't worry about the o2 sensor unless it's really lazy ie:slow. Definately get the shocks and struts done as well as those rear shoes. If the drums are in/close to spec I would run them. I wouldn't spend $100 on iridium plugs, probably run some new ACDelcos...
No matter how many posts people read on this forum it is hilarious how many people waste money of synthetic oils and drop them at 5k. Blows me away everytime!
And for Peace of Mind you Say?? You don't even have a friken clue what goes on INSIDE your motor but now all of a sudden your worried...