So far it looks like you’re going all out. If you’re getting the 8700k then you’ll want to pair it with something powerful like the GTX 1080 or 1080ti. That will push out enough power for 4K gaming and tackle any game out there right now and for the next few years.
Your case is considered a “budget” case but is still a good one. You could also look into the P400 if you want more space and a few extra features with that same aesthetic.
You will also need a decent PSU like a 700 watt gold rated PSU. You could get away with 650 watts just fine but I would stay above that level. Do some searching around for Tier lists for PSU’s and choose a highly rated one like one o EVGA’s Supernova’s.
For storage it’s up to you. My suggestion would...