Apizza in Stayton (different outfit, despite the name) is very highly regarded in the Salem area - it was the runaway winner of the "Eat Salem" blog Best Restaurant in Salem poll.
Hours are three nights a week (Thur - Sat) 4:30 pm to 9:30 pm. This will last through February.
I'm sure you'll be fine by going to Apizza Scholls. Keep in mind that they only do whole pies (no slices), and that they make a fixed amount of dough per day. When they run out, they run out. If you're going to visit, bring a friend to help you out and show up early if you go on a Friday or Saturday night.