My Antec sucks air threw an air filter threw the bottom and it gets nice airflow and it sits directly on the desk I dont see where that would be a problem. And most cases the front is plastic so you cant be heavy handed.
Just be warned, it has a cheap plastic front. I almost went for one but changed my mind due to the plastics, its fine if you are not very heavy handed though.
Also, it doesn't have a front air vent. It sucks air off the ground.
The plastic front is pretty nice looking and sturdy enough.
Also...there is a filtered front 120mm fan on the front of the case. not sure why you think it doesn't have a front air vent. It most certainly doesn't get the air from the ground