  We provide string theory examples where a toy model of a SUSY GUT or the MSSM
is embedded in a compactification along with a gauge sector which dynamically
breaks supersymmetry. We argue that by changing microscopic details of the
model (such as precise choices of flux), one can arrange for the dominant
mediation mechanism transmitting SUSY breaking to the Standard Model to be
either gravity mediation or gauge mediation. Systematic improvement of such
examples may lead to top-down models incorporating a solution to the SUSY
flavor problem.
