In the Quad Cities, there are two pizza places that receive high marks from me. There's Harris Pizza, and then there is Wise Guys Pizza. Wise Guys isn't as good as Harris, but it's close. It's got the same general taste as Wise Guys...it's spicy and thin crusted pizza.
If you dine in you can enjoy the buffet, which always has a good selection. Personally I enjoy their sausage pizza, but you really can't go wrong with whatever you choose.
Definitely make sure to check out Wise Guys Pizza. It may be a bit expensive, but it tastes great!