$1000 budget build

I've researched my parts for days, and I can't decide between two motherboards. One is cheaper but can handle only up to 2666hz of RAM frequency. The other one is more expensive and can support up to 3200hz.

Also, the case. Should I splurge? Initially, I'd take the Versa H21 or H25, the Raidmax Ninja II, or possibly the Kolink Aviator CAKL005. $30 to $50 on a case. What do you think about my picks for the case and would you recommend others? I know it's subjective, but I can't even pick out a few (I don't understand how)

The Tomahawk
https://pcpartpicker.com/list/36nQYr

ASUS Prime
https://pcpartpicker.com/list/BXK39W

How much would I benefit from the faster RAM? I kinda like both motherboards. Maybe you can recommend something else? The graphics card will probably change since I'm going to buy this build later this year. By that time current graphics cards will be updated.
 
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