Hello and Welcome! Yes, a lot of people on the forums recommend screen cages because of the airflow, which combats respiratory infections. Although, people still use the non-screen cages with positive results.
The way I keep my humidity up is with frequent mistings, i try for 5 a day, and lots of live plants. I live in southern california, so it is very dry and hard to keep up the humid, thus i had to get a cool mist humidifier. it keeps the room perfect.