At the very least try to make these folks friendly acquaintances.
Someone in human resources will likely already have an ear to the ground when it comes to layoffs or new job opportunities within the company. This person can also be a good sounding board for salary and personnel issues.
You should also try to befriend your boss's assistant, the gatekeeper to your boss. He or she can get you on the boss's schedule and alert you to the boss's mood.
Finally, reach out to the office rockstar. You know who that one is: the person who just kills it day in and day out.