none of them you posted look very good,the airflow on the second case looks bad.
out of a budget to 0-50 i think this is the best your going to get of newegg.
http://www.newegg.ca/Product/Product.aspx?Item=N82E16811119115
Those two are straight out bad quality, unless you're settling for a budget build or a really low-end home/office PC.
For that price you can get what Nevakonaza suggested or the almighty case:
Here is a kick-ass deal on the Antec Three Hundred
http://www.microcenter.com/single_product_results.phtml?product_id=0283272
nah Cooler Master HAF 932. Beautiful case.