  We introduce a set of CMSSM benchmark scenarios that take into account the
constraints from LEP, Tevatron, $b \to s \gamma$, $g_\mu - 2$ and cosmology.
The benchmark points are chosen to span the range of different generic
possibilities, including focus-point models, points where coannihilation
effects on the relic density are important, and points with rapid relic
annihilation via direct-channel Higgs poles, as well as points with smaller
sparticle masses. We make initial estimates of the physics reaches of different
accelerators, including the LHC, and $e^+ e^-$ colliders in the sub- and
multi-TeV ranges. We stress the complementarity of hadron and lepton colliders,
with the latter favoured for non-strongly-interacting particles and precision
measurements.
