as for me, i personally like the platinum, just for aesthetics, other than that, as long as they have the same operating speed, they are basically the same, and you wont find much difference between each.
go for the i7, as they are now more op for the price to performance than older gen cpus,
also for the gpu,
you are paying $600 for a single 980 card, unless you are planning to put the card into a water cooled loop, i see no reason to get it.
You can easily get a 980 ti or two r9 390x cards with $600
everything else looks good.