Originally Posted by Retrofit
The advice I give people is grow what you use. With 4 beers under your belt, I suggest looking at your favorite beers. Figure out their general recipe, the look at the reoccurring hops. I still think you should grow what you use. In your case, based on your favorite beers, you need to figure out what you might use. Something to dwell on...
This is good advice.
Due to your brewing experience level (I'm at a simpler point myself), I suggest you buy a little bit of many types of hops. Take them home, smell them, make long and short boil tea out of them, see what flavors you like most.
I would suggest you get one bittering type plant and two or three aroma.