Ah, of course - you will want it as quiet as possible, that makes sense.
In that case, I will modify my spec a bit:
Change the GPU to this Passively cooled 4650.
And for the case fans use two of these.
For the CPU cooler, use this heat sink and this fan (use the black voltage reducer).
I would also suggest not overclocking too high. The higher you overclock, the more heat is produced and the faster the fans spin. I'm sure that 3GHz of i7 power should be enough for your workload.
With these changes you will have a very quiet system without having to go to the expense and effort of watercooling.
That sounds brilliant having a passively cooled GFX card. I never realised they existed.
Also them fans, already have two in current system build (I'd forgot there name, hence why not mentioning them earlier, was going to try and describe them by colour but felt silly trying to do so), So I can use them in new build I remember I did a lot of research last time and they where the best. Amazing to see they are still the best after so many years. But yeah they are very silent.
Thanks for the Heat sink recommendation, as I was completely lost on that aspect.
Thanks for your help again.