Hello,
That's a nice looking build! The only comment I'd really make, which is completely the oposite of what you are asking (sorry!) is, if you're spending $1000 on a computer, why the cheap case? I'd be inclined to spend $40 more and get a good quality chassis.
In the past I've bought cases for ~£20($30) and they've held the components together OK, but dismantle your computer once or twice and they soon become flimsy and nasty and I used to replace the chassis every time I build or upgraded.
More recently I spent about £80 on a good quality antek case and it has lasted for 9 years with numerous different builds inside it. So if you want some longer-term value, a good quality chassis can easily last a decade or maybe more, out-living all the rest of your hardware. Not to mention making your PC seem so-much-nicer
To actually answer your question though, depending on your system's workloads, what games you want to play, videos you want to render etc you may find that CPU is overkill and dropping it to the model below may not result in any noticable difference. It's hard to offer any real advise on that though without knowing more about what you're going to use your machine for.