Kyle,
You can't call up the Geostatistical Wizard in ModelBuilder. What you can do is run some data through the geostatistical wizard to parameterize your model, save it as a geostatistical layer file, and then use that file in subsequent steps using the geostatistical tools in ArcToolbox. This approach may be appropriate provided that your variogram parameter, like the nugget, sill, and range, don't change much between datasets.