Probably not good competitively, but I have always enjoyed and had fun with a havoc squad all missiles for the 4 little templates.
Noise marines as well, expensive but lots of firepower in one squad. I ran 5 with special options and moving I had range 24" 6xS4, AP5 with 2xS5, AP4 and a template weapon (more shots if you sit still). Not bad from 5 guys, especially as in CC they go before the majority of guys, and the champion with PW can do some damage.
I also had a fair amount of fun with a full 10 man Thousand Sons squad. Move and shoot 24", and AP3 bolter fire. Means up close you'd get 18xS4, AP3 shots, plus whatever the Sorcerer had (say Doombolt? another 3xS4, AP3 shots).
So at 18" you'd get 12 shots, all of which ignore everything except terminators.