Cases are: Be Quiet Pure Base 500, Antec NX600 That's basically what I can get at the store that I buy my parts (this store is the cheapest and with the highest product selection). other case are just too expensive..
Is this an online store? If so link us to it.
When it comes to cases you're sometimes better spending more on a case with preinstalled cooling than buying a cheaper case and having to supply your own fans!
Out of those 2 pick the pure base 500.
It comes with 2 x 140mm fans, one front and one rear.
Remove the rear, add it to the front as an extra intake and buy a decent single 140mm fan for the rear exhaust.
That gives you 2 x 140mm matching intakes and a 140mm rear exhaust which is more than ample for 90% of systems.
ALWAYS pick a case that supports 140mm fans over 120mm.
3 x 140mm fans will do the same job as 5 x120mm fans generally and the extra surface are on intakes give a more uniform and spread airflow throughout the case.
You also benefit from lower max rpm and lower noise levels.