I managed to get a Fractal Design meshify 2 for 60 quid with 2x 140z at the front and a 120 at the back, i placed another 120 at the top but set it back and tested the airflow with an incense stick, fantastic result.
It looks like it can support an extended but you will have to double check that, however it comes in a mini or XL but your budget can strain a bit there. Im not a fan of fish tank and fairy lights and Fractal seem to be able to produce practical quality at a low price point if thats any use to you.