If anybody has one of these cases and would like to share their input to which case i should get you would be a great help. Also you can suggest me other cases that you like too, as long as they have USB 3.0 headers and is an overall good reliable case Under $70. i have an Asus M5A97 R2.0 motherboard. thanks for your help!
912 ftw out of those two, the rosewill challenger cases dont even have a 8pin eps power cable hole - makes for a very untidy build unless you mod it.
The 912 is also good in that you can bugger off that middle hdd cage and have better airflow. Overall a much better case.
As for usb3 - be sure to get the HAF 912 Advanced as there has been a few revisions over the years. The Advanced has both 2x usb2 at the top and 2x usb3 via a 5.25" bay slot that comes included.
http://www.coolermaster.com/case/mid-tower/haf-912-advanced/
In terms of other cases that are under that $70 mark (im assuming you're in the us) there is the following to consider -
> bitfenix comrade http://pcpartpicker.com/part/bitfenix-case-bfccom100kkxs1rp
>corsair 300r http://pcpartpicker.com/part/corsair-case-300r
>corsair 230t http://pcpartpicker.com/part/corsair-case-cc9011036ww
>nzxt h230 http://pcpartpicker.com/part/nzxt-case-cah230ib1 (makes for a very nice build)
>fractal core 3000 http://pcpartpicker.com/part/fractal-design-case-fdcacore3000usb3bl
>bitfenix shinobi (with or without window either way a brilliant case) http://pcpartpicker.com/part/bitfenix-case-shinobiwindow
Hope this helps.