  We discuss methods to obtain accurate hadronic spectra with propagating
quarks. Comparing the determination of masses for spin-exotic hybrid mesons
with glueball mass determinations, we conclude that quark propagators from all
sites to all other sites would enable great improvement in the errors. Such
propagators are achievable by using stochastic estimators. We discuss previous
attempts and present our method for maximal variance reduction. This is a very
promising technique and we illustrate it by obtaining the spectrum of ground
state and excited B mesons in the limit where the $b$ quark is static.
