Personally I'd either go Blood Angels Terminators or Grey Knight Terminators. That's my thing.
A. Grey Knights if you want psychic boogaloo with Hammerhand/Sanctuary and Vortex and all that jazz. Bring fancy paladins if you're feeling extra manly. (Also seem to be most points appropriated, yet still a little expensive. All terminators suffer this syndrome however.)
B. Blood Angels Terminators with furious charge and + 1 Initiative, here they shine with either claws or hammers, so choose for your meta. Bring your favourite named character (Read: Mephiston/Dante) and proceed to punch everything in the face.
I use to play DA Deathwing back in 6th and I heard in 7th they've been nerfed, a lot of their sexy abilities being ripped out and given to vanilla marines in their decurion detachment equivalent.
Points drop for vanilla terminators, so they're cheaper. But still not low enough to be taken seriously, I suggest sticking to other chapter-specific codices (However I heard Gorgon Terminators for the Iron Hands are good, not sure.)
Chaos Terminators from what I've seen are outdated and you shouldn't touch with a 10 foot pole.
Of course, if you're gonna play for fun rather than WAAC. Choose the terminators that YOU want. If you want those sexy cream-coloured death-dealing plasma-spitting Deathwing than choose them. If you want the silver-plated Halberd-swinging psychic knights than choose them. If you want the blood-drinking face-stomping golden-boy lovers than choose them. Whatever works man.