If you want to experiment and fine tune your brews, then going all grain is your answer. You can use any of the 100's of grain varieties out there, and not be stuck to LME or DME for your base fermentable.
I moved from extract to all grain in college, not too bad on the pocket book... but this hobby does get expensive over time. I started with a basic igloo MLT, an 8 gallon pot and a turkey fryer, and now I have a full RIMS setup. It's all just how fancy you want to get, or can afford.
At any rate, you are in the right place. Just start reading. a lot. then read some more.