how about flat?
I used gloss automotive paint (Acrylyd) for my interior and it was the worst month of the entire build process. As a first time painter, getting it to lay down flat and smooth with no runs, drips, errors, dust, etc. was way more difficult than I thought it was going to be.
If I ever do it again, I'll seriously consider something flat or maybe satin. Shooting primer was a breeze. Shooting this stuff was like painting with milk.
Make sure you spend a little time with someone who can show you several types of paints, how to apply them, and what the result is going to look like.
-Clay