I rebuilt this system to try to reduce the noise of the PC. The only components that I changed were the case and the fans but I had to disassemble most of the parts anyway.
My previous case was the Zalman z11 plus. Originally I bought it because it was cheap and came with a good number of fans. However, it had little room to cable manage leading to me having to jam the side panel on and I also broke the power button due to the hard to detach front cover. Another, bigger problem was the noise. To combat the broken button I used the reset button as the power switch, but that made a loud "beep" every time I turned the machine on. Also the fans were very loud, even at lowest speed with half of them turned off. I bought a fan controller but the fans came on at full speed and it took 10 seconds when I turned on the PC to turn down the speed, leaving the sound of a jet engine throttling down. After 9 months of solid use I thought I would try to make a near silent PC
When choosing a new case I wanted to make sure it was well sound-proofed. Also I didn't want something that was too flashy, which was kind of a change of heart after the z11. I liked the look and features of the fractal define r4, especially the noise proofing, storage capabilities and cable management options. I wouldn't be watercooling but it was also nice to have options available for the future. When the r5 came out with many improvements over the r4 I knew it would be my next case. One of the best improvements was the ability to change the direction the door opens, since the default position would be the wrong way for me.
I chose my fans before my case and so did not exactly know the exact size or amount I would need. I went with 4 sharkoon silent eagle 1000s since they were very quiet but provided ample airflow. I probably should've used 140mm fans but as I had already bought them I decided not to change. Also I bought one too many as I only ended up using three since there was little room for one next to the PSU. These fans are pretty quiet although if I had thought about it more I would've gone for 3 140mm low noise fans instead.
My component choice was the same as my first build. They were mainly standard for my price range although my graphics card, the r9 270, is cheaper than even my motherboard. This was because of two reasons, one: because my main screen was 1680x1050 so did not need a better graphics card to power it (although this has been upgraded to a 1440p QHD one now) and two: I was running out of money nearing the end of buying my components. I plan to upgrade to a gtx 970 when they come down to around £200 but for the games I play at the moment the r9 270 works just fine.
Building in the r5 is an absolute joy. I had far fewer problems then in the z11. There was plenty of cable management rooms around back and all panels in the case were easy to detach and reattach. The latch mechanism for the windowed side panel saved a lot of time in the build process. Also the velcro loops in the back meant that only two zip ties were even needed. I finished in 40 minutes by myself in not the most ideal workspace, although I didn't have to install the CPU or its cooler. I would definitely recommend the define r5 as a good sub £100 case for anyone building a PC.
Overall I think that the upgrade was worth it in terms of looks and noise. Although the build is not totally silent, it sure is a lot quieter than before. Also there is plenty of ways to upgrade my PC in this case in the future.
tl;dr - I upgraded my case to a fractal design define r5 to improve the noise.