Right now, I have a couple marble rays, a henlei, a black arowana, tig growing out (about 6") and a sunshine pleco. I'm also setting up a 300g tank.
WHen I look back on all of the tanks I've had, one rivals my setup now. It was 60x18x26 120. Black backgroud, black sand and some river stones. I had a dualbulb light strip (t8) one actinic light. The stock was a male Cyano, and a couple male jacks. I had 2 xp4 filters so the water was always crystal clear. Man I loved that tank, and thats with every day jacks!!!
Pick something you really love and build your tank around it.