Budget pc case with good airflow

My specs (besides the ones im going to buy):
I5 4460 3.2 Ghz quad core
Asrock h81m
1tb seagate hdd
6gb ram
I will buy a gtx 1070. The problem is my pc is a prebuilt one, so the case and especially the psu are incredibly bad, as the psu has no 8-pin or even 6-pin cables, so im gonna buy a new one. I asked a few questions on this forum and I know what to choose. But I still dont know what to do with my pc case as it has absolutely no airflow, only some ventilation holes on the front and back part. Can someone suggest a bugdet pc case that also has an acceptable airflow and fits all my components? At around 40-60$
This is my current case: http://www.pcgarage.ro/carcase/spac...
Should I buy a rear exhaust fan gtx 1070 and keep the case or one with a blower fan and also buy a new case?
Thank you in advance!
Btw, don't bother telling me other stuff, like how the i5 is gonna bottleneck the gtx 1070, because not only I heard that thousands of times, but it isnt even remotely true, as the bottleneck percentage is only at about 17%, so its not that of a big deal.
 
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