I've put together one over a decade ago at school in some computer class/course for whatever reason. No, i don't recall a thing about it, other than that someone else managed to blow up a PSU. Also installed some part (network card?) to another computer but that is simply a matter of putting the module in its place, IIRC...Have you built a computer before?
I'm thinking i'll buy the computer from some place that puts it together as well, even if it costs a bit extra, i'd rather not mess up things. That, or ask my friend for help.
I pretty much followed the "Excellent - Best Overall" build from OP - and it is awesome. I can play the Witcher 3 at almost always 60 FPS on Ultra graphics (No Hairworks) at 1080p. The GTX 970 is a great card for the value.
Of course, I'm not sure how much the prices are for parts in your country, but if you can get parts from the next column (Enthusiast - Nice Things), or the next column, its a good idea. 1500 pounds is about 2.3k USD right? So yeah you have tons of money to buy parts for an epic PC.
1500 euros, not pounds. But perhaps the difference isn't that big.
I'll study the best overall bracket and see how much similar computer would cost here.
Also going to need a monitor, keyboard, headphones/set, mouse, joystick... Those get their own budget, me thinks. Fortunately i can afford that... Probably.
And, oddly enough, i realized i have a mouse pad already, a teflon/metallic one. Can't recall where i got one but i've never used it (too big to fit next to this laptop).
EDIT If only i could be sure about a future game i'll want. Or even some this/last year release... Going to feel silly having a new computer and playing something that won't even tax it (or better yet, uses less than 1/100th of available power, like original Command&Conquer...).
EDIT Hilariously, this store i'm looking at, it offers an ultimate custom monster computer, something whose price is 27 000+ euros. Quad SLI-Titans, server-motherboard with ridiculously powerful CPU, 8 TB SSD space, custom liquid cooling. Who the heck wants something like that?