Cpu mobo and ram are all good choices.
I am not sure about the case as I stopped looking at them since I bought mine so sorry I cant help there.
As already mentioned if your going single card a 650w power supply would suffice.
The green hdd are fine and are very good even for gaming. I have a green and it still plays games fine. I only upgraded to another ssd because it was an xmas pressie but the green did me fine without being loud.
The corsair ssd are good but there are better value ones out there look around. The 250gb sandisk drives are quite cheap and are pretty good and wouldn't be much more maybe 20-30 quid.
Only other thing would be if you plan on using that fan on the cooler go for the sp not af as it will be better for the radiator. I just picked up a set of quiet editions and they are silly quite. I didn't even need the reducers.
Looks like a good system. Only thing I havn't a clue about is amd graphics cards so maybe someone else could advise you better on that one.