Want advise on building a gaming pc with a budget of £400

hi guys,

im planning on building my first ever gaming pc, i'll be mostly used for gaming.
my budget is £400

I'm a noob when it comes to something like this, any advise or suggestions are welcome
so far i've got on my list:

GPU: Asus Nvidia GeForce GTX 750 Ti Graphics Card (2GB, GDDR5, PCI-Express 3.0) by ASUS £99.99
memory: HyperX FURY Series 8GB (2x 4GB) DDR3 1866MHz CL10 DIMM Memory Module Kit - White by HyperX £35.07
case: Zalman Z3 Plus ATX/M-ATX Tower Case - Black by Zalman £37.25
power supply: EVGA 500B 500W 80+ BRONZE PC Power Supply by EVGA £37.99

Cooler Master RR-212E-16PK-R1 Hyper 212 Evo "Ultra High Performance, 4 Direct Contact Heat Pipes, Universal CPU Cooler" Black Fan by Cooler Master £27.37
WD 1TB 3.5 inch Internal Hard Drive - Caviar Blue by Western Digital £38.70

CPU: AMD Athlon X4 860K Quad-Core 3.7GHz 4MB Socket FM2+ 95W Desktop Processor by AMD £55.09
mother board: ASUS AM1M-A Motherboard (DDR3, S-ATA 600, Micro ATX, PCI Express 2.0 x16, HDMI, VGA, DVI-D, USB 3.0, UEFI BIOS, Socket AM1) by ASUS £26.11
SSD: Kingston Technology 120GB Solid State Drive 2.5-inch V300 SATA 3 by Kingston £37.00

total: £394.57.

thanks in advance!

http://uk.pcpartpicker.com/p/nXhYFT

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (£139.80 @ CCL Computers)
Motherboard: Asus H81M-PLUS Micro ATX LGA1150 Motherboard (£41.59 @ Dabs)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1866 Memory (£33.99 @ Ebuyer)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£34.92 @ Aria PC)
Video Card: MSI GeForce GTX 750 Ti 2GB Video Card (£89.99 @ Ebuyer)
Case: Cooler Master N200 MicroATX Mid Tower Case (£33.71 @ Amazon UK)
Power Supply: XFX ProSeries 450W 80+ Bronze Certified ATX Power Supply (£33.59 @ Aria PC)

If I was you I would try something like this, you'll benefit from the 950 over a 750ti. If you have any questions and or concerns feel free to ask.

The Build: http://uk.pcpartpicker.com/p/R3kb99

Bout 150 left in the budget, I'll check out some 950 Vs 380 stuff later, currently it's an 860k build

http://uk.pcpartpicker.com/p/FhqWqs

Here's what I'd do, really compact (fits in a backpack, see @VXAce's topic with a build in this case, so you could easily get to friends' houses with it and have LAN parties :D), G3258 (because it's cheaper in the ITX form factor than an 860k in the UK), 4GB variation of the GTX 960.

http://uk.pcpartpicker.com/p/8Fdg7P

I usually would't recommend the pentium though, being a dual core. It's decent though. If you really want to go with an 860K option, you have to cut down on the GPU price a bit and go with a 2GB model, and change the storage drive to a seagate option. It's still just under £2 over budget but you could get that money together easy:

http://uk.pcpartpicker.com/p/pV6mTW