  We propose and analyse a GUT-inspired version of the MSSM featuring non
universal sfermion masses boundary conditions and asymptotic b-tau Yukawa
coupling unification. The particle spectrum of the model gives rise to extended
coannihilation processes, involving the lightest sbottom and the tau sneutrino.
We study the allowed parameter space, subject to cosmo-phenomenological
requirements, and the details of the new coannihilations modes. Implications
for direct and indirect neutralino searches, as well as for collider physics,
are also briefly summarized.
