You might want to give Caponie's a look. They've got a wood-fired brick oven and produce a respectable Margherita. A little bit thinner and crispier than Spaccanapoli (which I prefer), but still a good value if you're in the area looking for a light dinner. It has a pleasant neighborhood ambience to it as well, along with other offerings, which, other than their antipasti (a generous salumi platter, probably drwawn from local providers), I haven't tried.
Caponie's
3350 N Harlem Ave
Chicago, IL 60634
"The fork with two prongs is in use in northern Europe. In England, they’re armed with a steel trident, a fork with three prongs. In France we have a fork with four prongs; it’s the height of civilization." Eugene Briffault (1846)