I haven't played a game in 8th yet, but theory-hammering, storm shield terminators are still good for being hard to remove, indeed with two wounds they're twice as hard to remove with basic weapons as they were before. As said already they can have a reliable deep strike exactly 9 inches from the enemy, and if you're very lucky you might even get to charge with them that turn. The basic shooty terminator is the cheapest base cost and have the options of cyclone and assault cannon, which are nice.
Tartaros are what I would take if I were taking lightning claws. They're just a bit faster than Indomitus terminators meaning that if they have to run somewhere they'll get there sooner. That said, I like the reaper autocannon option.
Cataphractii have only the heavy flamer as a weapons upgrade, which is a bit of a bummer, and they are the slowest terminator variant, but they do have a 4+ invulnerable save, making them just a tad more durable against powerful weapons than the other (non-storm shield) varieties. I like the ability to take a single lightning claw in the off-hand to keep the cost of the unit down.
My inclination is to set up most terminators that don't have storm shields primarily for ranged combat since that means they'll always be able to affect the battle provided there are enemies within 24 inches. That said I do have piles of terminators thanks to raiding eBay, so I should probably paint them all and get them on the table.
"They shall be pure of heart and strong of body, untainted by doubt and unsullied by self aggrandisement. They will be bright stars in the firmament of battle, Angels of Death whose shining wings bring swift annihilation to the enemies of man. So shall it be for a thousand times a thousand years, unto the very end of eternity and the extinction of mortal flesh."