I play tau and grey knights. I've played tyranids, eldar, and dark angels. I am horrible about sitting down and painting all of them, which is why I sold the tyranids >.<
The last battles i used to play when i was 12 (now 23) I had a tendency to charge what ever i had left (mainly a squad of black templars) into a squad of well positioned chaos after firing my rocket launcher once or twice, thus ended in my being ripped apart by more powerful squads/characters lol.