I'm pretty sure that the XFX 450W was a better option. Anyway I COMPLETELY changed the list and I will give my reasons.
Firstly, here's the link: http://de.pcpartpicker.com/p/3calJ
I went for the Athlon 760k because it's basically an APU with the integrated graphics turned off, at an amazing price. Furthermore, look at the APU. It's great for a PC that sits next to the TV, but it's not so good for a dedicated gaming PC, especially not a budget PC. My reasons: You're at a low budget, when you wanna upgrade, you can't really just change the CPU, or change the GPU. You'll have to either purchase a combination of both, or another APU. Bad idea my friend. The Athlon 760k is great, won't bottleneck a high end card too much, so even if a year or two down the line if you wanna upgrade your GPU, you won't be wasting the CPU. Also, the Athlon 760k + the GTX 650 Ti will DEFINITELY outperform the A10 6800k. Like, is that even a question?
Remember: You can't spend an extra 30-50 euros and add another 4 gb of ram but you cannot spend an extra 30-50 euros and just upgrade your 6800k to a 7850k or something. You aren't wasting money by going with 4 gigs of RAM and believe me, you aren't bottlenecking MOST games with it. Only titles like Battlefield will require that extra RAM. Plus, you can just add another 4 gigs a month or two later. But you can't make your 6800k have a better integrated GPU after a month with 30 euros.
I went for a fractal simply because it costed less and you don't need to buy the extra fan. Also, as for the power supply; yes it'll be a little messy in there but it shouldn't be too difficult to route the cables. I'm using an Aerocool DS Cube with a 450W XFX (same as the one I included in the link), and although I was a bit annoyed while setting it up, in hindsight, it saved me money and we all KNOW that XFX quality is unparalleled.
Lastly, your 650 Ti by Asus is a beast, and even if you don't go for that particular graphics card (look for a 750 Ti or a 265X), you still have around 128 euros to purchase a graphics card (assuming that your budget is 500 euros).
Edit: I would lastly like to add that I'm running an XFX 450W myself, with a Sapphire HD 7850 as well as an Athlon 760k with 4 GB RAM. The Sapphire 7850 does marginally beat the 650 Ti, just letting you know, and it consumes more power. I have no problems and have been running this rig for over a month. :) xD