That does sound like a bear of a commute. One difficulty in Decatur is the time it takes to get to I-85 and then to 400 and vice versa. It is very congested at peak traffic times on Clairmont and N. Druid Hills Rds.
Having said that, it is very easy to get to Downtown, Midtown and other intown communities from Decatur.
Have you considered North Druid Hills? There are some great intown neighborhoods there, and you are very accessible to I-85, 400, and Decatur. Some very interesting things are planned for NDH in the near term.
www.ndhra.org