Hey all, I live in Evanston and make frequent trips to LFS's around here. Here is my 2 cents after having gone to each of these LFS's over a dozen times.
Old Orchard -
Best Invert selection, well knowleged staff
Way overpriced corals, small fish selection
Living Sea -
Best fish selection which gets replenished often, alright selection of corals
Only 1 or 2 knowleged staff on hand at any time
Chicago Aquarium -
Best priced coral selection if you talk with Ken, nice and knowlegable staff
Lacks good fish selection
I'm definately making time to get down to A Splash of Life.