With seating for up to nine people, substantial towing capacity and aspirational appeal, GM's biggest family haulers have recently accounted for more than 60 percent of full-size SUV sales. GMC's version, the Yukon, bridges the gap between its Chevrolet Tahoe and Cadillac Escalade siblings with a lineup that includes a base model priced similarly to the Tahoe, as well as a distinctive Denali model that can approach Escalade prices when fully loaded. While the outgoing Yukon continues to serve millions of families well, the impressive new 2007 Yukon all but antiquates the model it's come to replace.