Quite late, but:
Bad time during college apps+mediocre everything = yikes
Rejected (all cs): Princeton, Yale, Stanford, MIT
Accepted: UIUC ENG CS
Super glad that I ended up here. Didn't realize how crazy the program had gotten so quickly (34.6 departmental average ACT for incoming class... 92k avg starting salary for previous leaving class, almost guaranteed internships every summer after freshman year, $180mil/yr funding from NSF (compare to MIT/stanford CS 80mil or berkeley 110)), and I'm lucky and so so grateful to have even gotten in with my apps.
The reality is that (at this point), there is indeed a gap between mit/stanford/carnegie and everyone else at undergrad level (even berkeley), but opportunities abound regardless.
Great place, nice people, turn up ! I am up for any questions related to UIUC :)