Would recommend a far cheaper setup than that which Jedi has posted. You will never use most of the features of a board that costs more than 150 quid. Spending a lot of money on a good motherboard isn't really worth it unless you have some specific additional needs in mind for connectivity or running many expansion cards etc.
If you're using a single graphics card (which you really should be if you don't have more than a single 4K monitor) then almost any Z490 type motherboard is fine. MSI are my go-to pick but it won't really matter which you buy. Don't get a MicroATX as you will pay a slight premium for it being smaller and probably loose some connectivity too. Plain old ATX is the best value.
My recommendation would be the MSI MPG Z490 GAMING PLUS because it's from a reputable brand and is the cheapest. I am assuming that you don't need WiFi built in.
For RAM: All of these boards will support ridiculous RAM clock speeds. I'm just going to pick you something with a decent response time and from a good brand. Anything over 3000mHz is fine. Realistically you will never notice the latency or clock speed on RAM for general/gaming applications anyway. My recommendation would be two of these sticks: https://uk.pcpartpicker.com/product/QBrYcf/kingston-hyperx-fury-16-gb-2-x-8-gb-ddr4-3200-memory-hx432c16fb3k216
You don't need more than 32gb for general or gaming purposes. If you do a lot of design work maybe consider 64gb.
On the note of LEDs: Just completely ignore LEDs and order what has the best specs. LEDs or not. Better value usually means not having to deal with needless lights though, even from brands like MSI, Gigabyte, Asus etc. who will certainly offer RGB on their worse value boards and RAM. Also you can now buy a properly soundproofed case