U of I uses Urbana-Champaign because *technically* the main address of the school is in Urbana. In fact, so are most of the academic buildings, while Champaign has most of the athletic facilities, and a lot of housing. Sororities are just about evenly split between the two.
Junior quota is new, so I can't comment on chances of getting a bid as a junior. Without it, there were only 3-5 chapters that would take juniors, but I don't know if that has changed.
Keep in mind, though, that even a "small" chapter at UIUC will have over 100 women, and because there are so many more fraternities than sororities, a full social calendar.
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