As others have said we really need to know if you need a monitor, operating system, kb+m or if you want to do any overclocking. But I came up with something anyway.
http://pcpartpicker.com/p/bnnrRB
I'm also gonna explain my choices a little as well.
CPU: i5 4670K
I've seen loads of people recommend I7s but for gaming there really isn't much point seeing as most modern games are GPU bound. You would be much better off, and see higher frame rates spending the money saved by getting a I5 over a I7 on a better GPU. Also as its a K variant it can be overclocked, so if you feel the performance is starting to slip in a few years time you can up the clock speeds a little and hopefully gain a decent performance boost.
CPU Cooler: Dark Rock Advanced C1
Now you can't have a K series CPU and not have a good cooler for it. Although i'm not sure if this is even available in the US but I personally love this cooler mainly for its looks and its quietness but it doesn't perform much better than the CM Hyper 212 evo. So if its not available or you don't care about looks then just grab that instead.
Mobo: MSI Z87 G45 Gaming
I haven't had any personal experience with this motherboard but i've heard good things from reviews and it comes with all the essentials at a reasonable price point.That being said, its not the best overclocking motherboard ever so don't expect to be hitting 5GHZ on it if you do decide to overclock.
RAM: Patriot Viper 8GB
Not much to say about this, RAM is RAM so feel free to swap this out for any other kit if you want. I would stick with 8GB though. Games struggle to use more than 5GB from what i've seen. Anyway if you feel 8GB is lacking then you can always add another 8GB down the line.
SSD: Samsung 840 evo 120gb
I own one of these and it's bloody fantastic, just shove the operating system and your most used programs on this and you're good to go.
HDD: 1TB Seagate Barracuda
Well you have to have somewhere to put all your games.
GPU: Gigabyte R9 280X
I chose this over the Nvidia 770 because DAI running on the frostbite engine is likely to get AMD Mantle support which should offer a nice performance boost over the Nvidia counterpart. The 3GB Vram also makes it a good choice from a future proofing perspective as well seeing as modern games are getting close to using more than 2GB at 1080P. If you really don't want to go AMD the Nvidia 770 isn't bad either, I just think it's a touch overpriced for what it is.
As a side note Nvida is supposed to be launching the 800 series in November so it might be worth waiting and seeing what that's about before buying.
Case: Fractal Design Define R4
From what i've read in reviews this is one of the best ATX cases on the market right now, I personally love its looks and the sound dampening material will keep noise to a minimum.
PSU: Corsair CSM 550W
Contrary to popular belief you really don't need more that 550w for a single GPU system, especially with Haswell being so power efficient. You could up it to the 650w Version if you feel uncomfortable with that wattage though. As for the PSU itself Corsair have proven themselves to be one of the more reliable companies alongside Seasonic so I wouldn't be concerned about it blowing up or anything. The 80+ Gold efficiency will keep energy bills relatively low as a bonus.
OS: Windows 7/8 Your choice
Monitor: I don't really know much about this, I just put it there so you could get an idea on the pricing.
Note: Sorry if for any spelling mistakes, Dyslexia's a ******.
Edit: Oh god I just saw how long this post is... I think I might have got a bit carried away 