Snorlax

Definitely.

Yes - IV makes negligible difference where the base stats are high.

Poorly its IV is not that excellent, but it is still pretty good! Especially the good moveset.

If his moveset is a defensive moveset I will surely power him all the way up.
But his moveset is a offensive moveset, I will save candy for a better one.

His IVs are awesome. Power up :)

IVs dont matter even nearly as much when you are talking about pokemon like Snorlax, Lapras or Dragonite because they have ridiculous base stats. I'd power up any of them at 70% iv or above.

That's a great starting cp, depends how many candy you have and how often you catch/hatch snorlax and if you like hyper beam. :)