Import that ridiculously high res model into Silo. (don't let me start talking about how much I think Silo is cool!). In Silo, go in the "custom" tab and click "Topology brush". This very awesome litle peice of genius lets you paint your edgeloops on top of the existing geometry to recrete a new topology that is exact to the original model. For a better explanation about this feature go to: http://www.nevercenter.com/silo/