Ok I've tried to take into account everyone's comments.
I had meant to put in a 6600k but must have changed it at some point whilst fiddling around.
I have looked at the PSU and chosen the 550w G2, I hadn't really done research into PSU but now agree that looks to be the best decision.
For the case I'm pretty set on the Be Quiet! case, I really like the aesthetics tbh.
For the CPU cooler, I was planning on going for a liquid aio for aesthetics and functionality, I have always disliked stock coolers and I wouldn't be able to see as much of my pc as I'd like with a big cooling stack. However I wasn't really sure which liquid CPU cooler to go with and would really grateful for any pointers here (The case supports either 120, 140, 240 or 280mm in the top which is where I was planning on putting it).
Thanks so much for all the help so far!!