Minor leak in the head gasket. The price quoted to us to replace the gasket by the dealership mechanic was $1200

Just recently we learned that our 2003 Olds Alero has a minor leak in the head gasket. The price quoted to us to replace the gasket by the dealership mechanic was $1200. We will be moving from Colorado to Michigan in less than a month where we know a reputable and fairly inexpensive shop where we would possibly get the car repaired. The dealership that gave us the quote told us we could probably make the drive if we kept a close eye on the temperature gage and check the coolant level in the reservoir frequently. The question is, should we try to drive back to MI for a cheaper fix with someone we trust, or should we bite the bullet and just get it fixed at our pricey dealership? Or. Should we try to find another place here in CO that could fix it before the move? Thanks a million.