Just for poops and giggles, I went ahead and put together the machine I built a couple months back in PartsPicker. The first thing I noticed that I previously missed entirely, despite all the oh so suble clues, is that you're over in New Zealand. Yeah, I should've noticed from your location field, and the .nz, and all that, but...eh. I know now.
So when I said some things were roughly equivalent in price, I was a bit wrong. My machine in ANZ dollars with your selected monitor costs
$2287. That said, it's a stout machine in a tiny package, and pretty well future proofed (though in retrospect, I should've picked a 600w gold rated PSU). Granted, Skylake and DDR4 are just around the corner, but I doubt they'll completely outclass Haswell/Broadwell on the desktop for a good while yet.
Oh, and despite the fact the CPU is advertised at 3.3Ghz,
it almost always runs at 3.6Ghz when you set your power profile to high performance in Windows. It's temps idle a bit higher when I do this, but...eh. It's a desktop, not a laptop, so I'm not too worried.
With everything together, it looks
like this (before I tidied up the wires). Lots of power, little space used.