...and....I'm going to recommend Healthy Habits in Bettendorf. Moon is the best over there, but pretty much everyone knows what's going on!
So...with that out of the way, start with the shop that is closest to you. If they don't work out to your liking, check out another one! None of the shops in the Quad Cities are nessecarily better than the others, but they all have their niche. It also helps that each of them support FORC in some manner!
Here are your 4 choices:
Jerry & Sparky's Cycling & Fitness
1819 E Locust St
Davenport, IA 52803
(563) 324-0270
Trek Store Davenport
3616 Eastern Ave
Davenport, IA 52807
(563) 386-5533
Healthy Habits
3374 Middle Rd
Bettendorf, IA 52722
(563) 332-5145
Bike N Hike
3913 14th Ave
Rock Island, IL 61201
(309) 788-2092