I heard great things about Higher Gear in Highland Park. My only problem with them was distance- I didn't want to get a bike from them and drag my carcass all the way up there if I had bike issues. The one on Fullerton is a closer alternative definitely, but I haven't ever heard anything abou that location's reputation.
I've done Cycle Smithy too. They're ok. My only problem I had with them is that when I questioned the mechanic after I brought my bike in to get fixed, and it still had problems, he got all uppity with me. Plus, they didn't fix the problem, and I didn't get my money back, since clearly, the same issue I had before, I still had. And they didn't fix it! I did, right in the store. To get to Cycle Smithy, you just take the #36 bus north on State Street, or catch the #22 North on Dearborn (from downtown). to north Clark Street (located next door to the Baskin Robbins... yum!)- on the west side of Clark (on the left).
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