If you're only trading with this computer, why are you certain you want an 8700K processor?  That's an i7 overclockable CPU.  Why are you thinking of 32GB RAM?  Not even gaming PCs need this much CPU or RAM.  For reference, mining rig builds go with the weakest/cheapest CPU, ie a Celeron G3930 which retails at CAD$58 compared to a 8700K which starts at CAD$460, and 4GB of the cheapest RAM sticks available, ie CAD$50 for a single 4GB stick compared to CAD$300+ for a 2x16GB RAM kit.

Spending CAD$2,500 just doesn't make any sense for a mining rig with just one GPU or for a trading PC that can handle 3 monitors; you can build both for much less.  That setup you linked would make an awesome gaming PC or VR PC though!