My corsair 200r is not doing it anymore the lack of airflow in the front makes it really bad for cooling.
I am willing to spend up to £150 on a case.
If you link a case if possible please use UK sites.
Just look up the 750D. Its dope, that's about all you need to know. Support for up to a 360mm radiator on top (3 120mm fans), two 140mm fans in the front panel, two optional on the bottom panel. Ballin.