Get a new Ryzen and I'd advice an ASUS ROG motherboard. Pick one that features what you will be needing out of your computer (WiFi, RAM Capability, Etc)
I'd personally go for an NZXT Case such as the 500i or 700i and maybe even their water coolers
If you are going for an RGB tempered glass type thing NZXT is the first stop to getting a pretty looking setup for a medium range pricerange.
If you are going for the whole RGB thing you might as well get G.SKILL RGB Ram as well while you are at it.
If you are going for RGB I'd advice against components being anything other than consisting of mainly Black and a little bit of White. Then you have the chance. to set your colours to anything you feel like at any time. The biggest mistakes I have made with past builds is getting colours that I am not fond of and then regretting it.
Obviously go for a fully modular power supply and I'd recommend a Corsair one. Had three of them and never even needed to get the last two. The only range of power supplies that haven't had issues or given up on me.
EDIT :- Just completely ignored everything you said in your post although I'm going to leave my recommendations as these are products I have had very good results out of. You also seem to have a lack of RGB but the things I have recommended are not the slightest bit tacky if that's what you are worried about.