rp,
Arlington Heights probably has the widest selection of Kymcos. They are basically a used motorcycle dealer. But they are pretty far North. Scooterworks on the North side of Chicago are expert on most things scooter, but they usually only carry the small Kymcos, they might order a larger Kymco. I live in the Western burbs, and have to take 2 trains to Scooterworks to pickup my scooter or to go home after dropping off (I bought the Super 9 there.) Don't know about Motoworks, but they probably carry mostly the smaller Kymcos. Also, I bought my Yager 200 at Otto Brothers Honda in Lyons which may be closer to you than some of the other dealers. I got a real nice price there, but I'm not sure if they're still carrying Kymco. The economy has really killed motorcycle sales the last few years, and most dealers are struggling.
Please note these Kymcos are very reliable, and much of the service is owner friendly and not difficult. I only use the dealers for the initial service, and tire repacement unless there is a warranty issue or something I can't handle....
Wil B.
Broadview, IL
'71 Guzzi Ambassador
'91 Nighthawk
'04 Kymco Super 9
'10 Kymco Yager 200gt