I personally endorse Sultan's Market as an outstanding salad bar option in that area (and stellar Falafel too!). If I can remember, they have awesome artichoke hearts (in some sort of light mint dressing maybe - definitely not the standard greasy/vinegar bombs), some odd-but-good (fried?) cauliflower thing, and all sorts of other tasty tidbits.
Sultan's Market
2521 N Clark St.
Chicago, IL 60689
(312) 638-9151
-Dan
p.s. Don't get the shwarma during non-rush hours, no matter how good it may sound at the time. When it's fresh and juicy, it's awesome, when it's dry and been sitting, not worth eating.