I don't like the 80mm in the rear...it'd be loud.
Also, the PSU mounts under the hdd cage & the power cord runs to the plug in the back.
I assume the 120mm intake is in front of the hdd cage.
Looks like the best bet would be reverse airflow...using the 80mm as an intake & the 120mm as an exhaust.
I'm sure there's better options for you airflow-wise.