While I like the fireknife suit setup the best, it is quite expensive and does rely on markerlights to be fully effective.
I generally take 2 teams of 8 pathfinders to give my commander fireknife and elite knives a boost in the first 2 turns. They also help the 3 broads and 2 hammerheads drop tanks and transports.
Often though I tend to face Nids, Orks or even recently a mob of DE after I blew up their raiders. This is where my missile pod and twin linked flamer suits shine. Firstly they helped drop the transports then in turns 3-5 they clean up most infantry.
Sure they need to get close, but when you have 2 teams of 2 that is 4 twin linked flamers. Even a 30 strong mob of sluggga boyz will go home early.
I know that Tau like range, which is why every suit I have, has a missile pod. I just find that far too often the game ends up with lots of enemies in my face and I like having the flamers to make them go away.