  We will consider a SUSY-SU(5) with one right-handed neutrino with a large top
like Yukawa coupling. Assuming universal soft masses at high scale we compute
the low-energy spectrum and subsequently the neutralino LSP relic density
taking also into consideration SU(5) as well as the see-saw running effects
above the gauge coupling unification scale. We found that there exists no
viable region in parameter space for $\tan\beta \ler ~35$. The $\tilde{\tau}$
coannihilation process starts becoming efficient for $\tan\beta \ger 35-40$.
However, this process is significantly constrained by the limited range in
which the stau is lighter than the neutralino. In fact, for a given $\tan\beta$
we find that there exists an upper bound on the lightest neutralino mass
($M_{\chi_1^0}$) in this region. The A-pole funnel region appears at very large
$\tan\beta \simeq 45-50$, while the focus-point region does not make an
appearance till large ($m_0,M_{1/2}$), namely a few TeV. Large $A_0$ terms at
high scale can lead to extended regions consistent with WMAP constraints and
remove the upper bounds in the stau coannihilation regions.
