You make some really good points
In terms of the lightning claws I kinda just like the look of them lol but if power weapons are just as good then saving some points sounds better.
Good point on the khorne berserkers, I was really just using them for fluff reasons but I really like the khorne marine body conversion kit from forgeworld so that won't be a problem.
My other question is the landraider a good idea? Would beefing up the terminator squad and deep striking them in be worth looking into or would they just not have a great chance of surviving?