WildCard999 :
I'd change the PSU, the BQ aren't exactly a good quality unit. Also if possible go for the 29" version of that ultrawide as you may find the height pretty small and at least the 29" version is about the same as a 24" 16:9 screen. Besides those the build looks good.
I would also advise making sure the games you play support 21:9 or can be properly modded to fit the screen. The games that do support it though look absolutely amazing!
Agreed . . for $0.01 CAD more, the 29" is the way to go.
NORMALLY you could probably go for an even bigger 2560x1080 if you drop down the video card to a 1070. The 1080 is definitely overkill, and the 1070 is more than you'd need, but the 1060 might not cope, so the 1070 is the best way to go in general. BUT - with video card prices as crazy as they are... well, the cheapest 1070 I see listed is about $67 CAD less than the 1080. That'll put you halfway to a 34" screen.
EDIT: wait, if you can get a 1070Ti for 565.85 CAD, then do it! That $100 would definitely get you most of the way to the bigger monitor.
Also, do you need the WiFi? Isn't that included with most new motherboards? (don't hold me to this, I never actually use WiFi on my PCs, but I thought it was a standard thing these days)
EDIT Part 2: Do you really need a motherboard with mutli-GPU support? A single 1070/1070Ti will be more than enough to handle anything you can throw at it with a 2560x1080 resolution. Might be able to save a little more going for a board without multi-GPU capability...