I won't give actual suggestions on parts, but don't overspend mate.
To start with, 16-24 GB ram is enough to last you years and years without having to get more, and you can upgrade to more whenever you need.
You don't need an i7 7700k or i7 8700k for gaming, it's just extreme waste of money unless you're gonna do some professional and highly demanding tasks on your machine. It could definitely be spent in better ways considering you want 3 monitors.
SSDs are definitely superior so if you have the budget go for all SSD, but other than that consider practicality of your build. You really don't need those components for casual use, such as gaming, and it's just a massive waste of money. Bragging rights aside, 1080ti and i7 7700k won't bring you any increase in performance compared to regular 1080 and i7 6700K.
Of course it's just my outlook on the situation. If you feel like you want the best possible components and you don't really care about performance/cost ratio then by all means go for whatever you like.