i use to go with power fists and power weapon on the sarge. But that sarge just underdo so much in cc, i actually want to lose him first, rather than a powerfist termi.
I realy need the power fists againts nob squads, carnifexes and wraithlords. But the amounght of attacks is low, compared to dual lightning claw termis, and what about thunder hammers? the 4+ inv save helps against power claws and so on. But then you lack stormbolters to shoot down swarms on the advance.
How do you guy tend to equipt them?
I hear the comment about the sergeant with a power sword. He's always the first of my unit to die because his power sword is so useless!!
When I use my terminators, there are generally 2 squads.
1. 3 with storm bolters and power fists, 1 with assault cannon and power fist, 1 sergeant with a power sword and storm bolter.
2. Belial with twin lightning claws, 2 with twin lightning claws, 2 with thunder hammers and storm shields, 1 with twin lightning claws and the Company banner (+1 attack for each squad member. Belial with 6 attacks on the charge!! Win!!)
The first squad usually operates as a shooting squad. 4 storm bolters and an assault cannon are going to hurt something. Also, as a troops choice, it's a great unit to park on an objective. There they can still shoot and be useful, and their 2+ save means that not much is going to move them.
The second squad usually works as an assault unit or as a counter-charge unit. I find the mix of thunder hammers and lightning claws works well against both anti-infantry and anti-tank/monstrous creature. (If you see you'll need the thunder hammers, just alocate wounds on a lightning claw instead). The banner bearer also makes sure that the thunder hammers do some proper damage with 4 attacks each on the charge.
Hope this helps. Now go forth and kill things in the name of the Inner Circle!!!