Help needed :(

Spaztical

Honorable
Aug 16, 2013
14
0
10,510
Hi, all i'm in the market for a new gaming rig.
Basing it off this : https://www.youtube.com/watch?v=43pXorOZ3MQ&list=PL02HDVnTgIcpNJxKroA2Ls05DdRuOLVag
But i'm using a Corsair 250D as the case.
What do you guys think? I'm not sure whether i'm going to be able to afford it yet, but hopefully I can. The problem is that all the parts (including monitor and keyboard+mouse) minus the motherboard come in at 533 pounds (VAT off through buisness). But what would a substitute motherboard be?
Another question is, wheres the cheapest place to buy the operating system? And how much will the prices drop by christmas?
Thanks Callum