go to either sho tanks in mundelein which is close by.. he has nice sps colonys for 30-40 and frags from 10-20 i thnk.. go to aqua pros also they have a nice selection.. or u can go to reefwise if u got the moola for it
+1 - Shotanks had a great selection last time I was up there and great prices, 30 - 40 for some beautifully colored acro and montipora mini colonies.. 10 - 20 for frags, plus all sorts of other cool stuff
picked up a black sun coral last time I was there.
Aqua pros is closer to you, but aren't you very familiar with them already?
Advanced Aquatics is nice too! Glenn has some nice mini colonies, and I did get an acro crab there (so may be biased, lol).... His prices are higher than aqua pros or Shotank, but still some nice stuff, and Glenn is really friendly.