Gaming Set-Up Help & PC Advice?

After several months of wanting one I have finally decided to plan a gaming set-up. I'm about to start an apprenticeship which will net me around £400 a month (£240 of which is free to spend) so money shouldn't be an issue and I finally have the money to invest in a set-up. Things on my list already include an xbox one, a BenQ gaming monitor, a scuf controller and obvisouly a desk and chair to have the set-up. My question to you is what else can I get for my set-up? I need ideas.
Also I'm looking to buy a fast tv and HD PC monitor and was wondering what specs I need. I will be using the PC for Live streams and random googling. Quite a lot of multitasking will be done on it. I may even use it for minecraft. What RAM would I need? Is Intel i7 good enough? And can I get all this for around £500-£600?

I hope you can give me some advice. Please no horrible or sarcastic answers.

For 500£ - 600£.
Get these specs to run any game on ultra setrings smoothly
Processor - fx 8350
Ram - A-data 8gb ddr3
Gpu- r9 280x
Psu.- 700w
Mobo. - ga 78lmt-usb3 or asus m597 le
Cabinet - with two inbuilt cooling fan