building a new lowpoly from a high poly mudbox mesh

GoK

Anyone have any tips or ideas on how to go about creating the low poly for this? I would normally bring the high poly model into max from mudbox and use the graphite tools but id like to know if there is a better way anyone knows of. This model is killing max and most of the parts are built from mudbox spheres so there is no real low poly..

Here is the model.