How high of resolution do you want? Something I've wondered about is using the gear sets out of RC servos to increase resolution. I'm not sure what the ratio is but it could easily be greater than 32:1. It would be fairly easy to make a disk with say 32 quadrature cycles on it, at a ratio of 32:1 that would be 1/1024 or .0009. I'm sure there is some downfall to this idea, just don't know what it is. Nylon gearsets are available for less than $4.
Phil |