Welcome to the forums
So, you want three motherboards altogether?
Asus build quality ranges from downright horrendous, to pretty good, and it can be hard to ensure that you get a good one of whatever model you go for, so be aware of that.
Mixing and matching your core components is the key to a good system. You need to settle on a motherboard, and then research it, have a look what other people are using, and what problems they are having.
Some motherboards can be picky about which
PSU they are partnered with, so again, have a search for your motherboard, and the
PSU in question and any problems will usually be at the top of a google search.
RAM is always a tricky one. Same applies really, research it, especially if you are going to be overclocking and tweaking the
RAM.
The cooler will also depend on your choice of motherboard. Some designs won't fit a certain way because of the motherboard's onboard cooling. Heat is always a factor in overclocking, and the quicker and more efficiently you can disperse any heat, the better. Some people prefer silent PCs, so that is another thing to think about.
I'm sorry I can't be a more specific, but you need to list your motherboard shortlist and we can go from there
