Thanks
@Journey, I guess there is people that I could contact if it goes terribly wrong!
Overall, do you think there will be much difference between my most recent update and the build in the original post?
If there's not too much difference in price, having RAM with a profile of 3200MHz will be better than a kit with 3000. Not a lot in it, but might as well get the best if the cost isn't too prohibitive.
As I said, I've never had an MSI board, nor really kept up with their product line, so I can't really comment on that. I've heard the Asus Prime X470-Pro is a solid choice, but whether it's worth the money over your original I'm not really sure. I've also said I always err on the side of caution with motherboards because they're not something you want to replace and I usually want to make sure it's got all the features and power headroom for future use (but then I do tend to want to overclock my CPUs. Whether you want to leave open such possibilities for the future or you're sure you'll never want any of that, well, that's up to you...).
The other major difference is the case. As others have said, the case doesn't actually make much difference to your performance, especially if you're not running a hot system.
I again tend to think a case is something I'm going to have to live with for a while as it's such a pain to change (I actually aim to keep my case through a two or three system builds if possible), so I like to be assured it's got enough space for expansion, bigger coolers, good airflow options, and that it's not going to annoy me with noise further down the line. I've had cases in the past that I thought were fine when I got them and then came to hate because they were noisy, they took in dust at a ridiculous rate, they were hot when I overclocked, or that I just hated working in when I made changes to my system.
But, if you're reasonably sure you'll not need to worry about any of that because you're just going to set up your system and forget about it, then again, you might not notice the benefit of a better case than the one in your first post.
Basically, the only difference in specs I'd say is 100% going to translate into a difference in streaming performance is the RAM - and that only a couple of percent. If stock performance is your only concern, then I can't strongly recommend the more expensive parts. But if in two years you decide... actually I do want to replace my CPU and try my hand at overclocking, fit a better cooler, etc.... then you might wish you'd have got a slightly better board and case.