Definitely instrument. But not the actual training. Just start studying the ground, and practice flying with precision. Get to know your avionics, especially what your GPS can do. Go up with a CFII and learn how to shoot an approach without the hood. Then you can end all your flights with practice approaches remaining VFR. And do it all while racking up cross country time. Then you'll be ready to tackle your instrument rating.
Everyone always says how much more difficult the instrument rating is to get, and how much better a pilot it made them. I didn't believe it, and didn't really prepare for it during my first 2 years of flying. (Other than racking up a lot of cross country time.) I really wish I would have, because they weren't lying. The instrument training is very challenging.