Opinion on my first build? (UK)

I have decided to build a pc for video editing and gaming. What do you think on the build and do you think I could spend the money better on other components? 

Specs:

Intel i5 4430 (I do not intend to overclock)

Asus H81m Plus Mobo

8/16gb ram (depends on income at the moment)

(For the above I've found a bundle on amazon for just £250 - £290)

Evga Nvidia GTX 660 (£150)

Kingston V300 120gb SSD. (£65)

WD 1Tb Black (£70)

Corsair CXM 600 watt PSU. (£65)

Windows 7 Home Premium 64bit. (£60-70)

I've bought a Corsair 300R Case ( bit overkill for my build but I just loooove it) and Asus Disc drive already.

Please note this is my first time building a PC so any feedback is appreciated, thanks.

(Video Editing - Programs like After Effects)
(Gaming - Current and maybe some next-gen games on high settings without dropping 30fps would be good, would a 660 be good enough?) 

(I've got a Benq Gl2450HM Monitor already so don't worry about me needing a monitor haha)

 

Two things I would definitely change.

Grab a better video card. You can get a lot more performance with AMD around this price point. I use an Nvidia GPU, I am not being bias.

Grab a better power supply. The CX series SUCKS! Grab a 550W XFX. It is cheaper, and higher quality.

Also, if you're editing, you might consider the 8350, or cheaper 8320. It's probably a little better at editing than a non-overclocked i5. You can keep the i5, if you wish to have an Intel platform.

Here is what I would propose:

8320 + 7950

http://uk.pcpartpicker.com/p/1Sf3h

You can grab an SSD at a later time. I would think about getting more performance out of your GPU and CPU first.

You should almost certainly be using Windows 8. You can mod it to look and feel like Win7. The important difference is that Win8 offers a performance boost, and more up-to-date tech. You might get your OS for free, if you're in some kind of education establishment.

like the guy above me i also recommend amd. But i dont know how the prices are in the uk so have a look at that first

Instead of the 16gb ram I could get the 7950 (£190) and not have to pay more. Didn't realise it was that cheap haha. Thanks for the feedback.

I've read reviews on the cxm and it seemed to overall quite positive? Why would I choose the xfx over the corsair? 

I know that you're probably in the mindset of "Corsair means quality". For the most part, that is true. Top-end Corsair PSUs are really really good. With PSUs, the brand matters very little. It is all about the OEM (Original Electronics Manufacturer). In this case, the OEM of XFX power supplies is Seasonic. The undisputed best, and OEM of Corsair's own AX series (kinda why they are Corsair's best unit). Quality Japanese capacitors. Safe, clean, stable energy. grab the CXM if you need a modular supply. The XFX is a cheaper, though.

The 7950 absolutely wipes the floor with the 660, and many other Nvidia cards. Grab the one I suggested. It overclocks like a c***. Has a 7970 PCB, a 7970 power delivery, overclocks like a 7970. It competes with the 7970 GHz. Very very good aftermarket cooler on that unit.

You can grab 8GB of RAM now. Then grab a further 8GB later. Maybe grab some RAM with low CAS latency. It will be better for editing. You don't need anything higher than 1600 speed.

I'm assuming still go for the 7950 even if the 660 ti is around the same price? 
Thanks very much, you're being a great help btw :D 

yes go with the 7950 100%. Budget builds like yours, amd cpus are the way to go. 

The 660TI is overpriced.....

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If  I was you I would get an i7  if you want smooth gameplay.Because when I did not overclock my cpu my gameplay would lag and once a overclocked my i7 to a couple of ghz  my gameplay were much smoother.

plus if I was you im just saying IF I was you id get an 850w psu and get a 780 gpu .

 

sorry if I got you confused,

Sorry If you misunderstood but my budget is the sum of the parts listed and I simply couldn't afford, at the moment, an i7 and 780 as much as I would like them haha. 
I've tried to get the best I can for gaming and video editing at the moment for around £700, I could fit an i7 into the build but then would have to downgrade other components.

With your budget, you shouldn't be disappointed at all. Pretty capable gaming and editing rig. Will play games on ultra if you grab the 7950.

You don't need an i7 for smooth gameplay, you need a decent CPU which should be able to fully utilize your GPU. There's no reason to go spending money on an i7 on a rig with this budget. It can be done but then the other parts will have to be sacrificed and it's nowhere near worth it.

850W is overkill and so is a 780 for this build.