greenmedic88 on 25 August 2009
Prices range wildly on cases. The difference between a good case and a bad case is not just price, but also layout, which helps with assembly and cable management and airflow for systems with overclocked components.
It depends on how much you're willing to spend.
I'd recommend an Antec 300 as a good entry level case designed specifically for gaming rigs, but then I'm also biased since I have a personal preference for their cases. They shouldn't cost more than $60, but you can find them for less on a good deal.
