  The most natural region of cosmologically compatible dark matter relic
density in terms of low fine-tuning in a minimal supersymmetric standard model
with nonuniversal gaugino masses is the so called bulk annihilation region. We
study this region in a simple and predictive SUSY-GUT model of nonuniversal
gaugino masses, where the latter transform as a combination of singlet plus a
nonsinglet representation of the GUT group SU(5). The model prediction for the
direct dark matter detection rates is well below the present CDMS and XENON100
limits, but within the reach of a future 1Ton XENON experiment. The most
interesting and robust model prediction is an indirect detection signal of hard
positron events, which resembles closely the shape of the observed positron
spectrum from the PAMELA experiment.
