Getting back in the habit

Since I finished school, I have enjoyed the feeling of not really having anything to do in the evenings. That coupled with living out of boxes while house hunting has made it rather easy to let things slide. Since the purchase of our first house should be complete this week, I figure that I should start getting back into the habit of studying for my A+ certification and increase my code skills. Just need to find the best code language to learn that will be beneficial for the future while effective in my current job. Any suggestions? I have made a number to fairly complex batch files to streamline some of the tasks at work, but want to get into some a little more complex than that. I suppose I could always go back over my C++ book since I did extremely well in that class.