A lot of low budget options out there with good cooling and cable management, it's really a matter of personal taste when it comes to the case.
Here's a case from Thermaltake, the Urban T31. Cooling from bottom, front, and top. Vents out the rear. And has plenty of room for cable management. And right now comes with a $20.00 rebate at Newegg.http://www.newegg.com/Product/Product.aspx?Item=N82E16811133259&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=