Chris is a good guy and his fish are awesome. You can see my trifasciata pics on apistogramma.com.
In your 55g, with the right rock/aqua scaping you can trying putting in a colony of borelli's (8-10 might work, if all of them are added at the same time, and there is no line of sight). I had 10 adult A.borelli in my 60 gallon, although that might be overkill for a first timer. Again, it will be nice if you can scape the bottom so that there are 3-4 'regions', then you can see some very interesting interactions.