Though the newish Buick Enclave has received plenty of accolades, it's the right vehicle at the wrong time for GM's smallest brand. The other two vehicles in Buick's lineup - the LaCrosse mid-size sedan and Lucerne large sedan - might better appeal to gas-conscious buyers than a large CUV, but they're far from leaders in their segment. A new LaCrosse, however, will reportedly be arriving as a 2010 model.