Good choice of cooler - they really do emphasise quiet. you WILL need someone to help you fit it though, it weighs a effing tonne. Someone will need to hold it while you bolt it or vice-versa. Oh also invest in a tube of 'Arctic Silver 5' thermal paste. The Dark Rock might not come with any and you WILL need it. AS5 is one of the best on the market. Make sure (though i imagine its fine) the Cpu cooler Height is within the case limits. My Dark rock was 165mm and my case at the time only took 160mm max. so the side didnt fit.
I would change the M500 120gb drive though, they are legacy and discontinued. Crucial's current line is the MX/BX200. A 250GB drive is £70 inc vat and crucial are usually free delivery, or you can stick with 120 for £53. I would be keen for you to invest the extra 17 quid for double the space because if you fill the 120 and want a bigger ssd, you're gonna have to buy it anyway. No point in paying for the 120 only to upgrade it again down the line.
Modular PSU is a good choice - i really wish i'd gotten myself a modular one at the time so i didnt have a cable nest in my case.
I'm not sure what you've put the above list together with, but i would also recommend you get it all from one place and triple check everything is compatible - particular motherboard and cpu pin sockets. Aria and Scan charge pretty high shipping (for me anyway) You might consider checking Aria and Dabs for their pre-built bundles. I got my Asus ROG board, an i7-4790k and 8gb vengence pro for £450 from dabs, or Aria do pre-assembled mobo/cpu/ram bundles with an overclock supplied and warrantied, all you do is bolt the mobo into the case.
Sorry for the wall of text! Best of luck with the build!