I have the option between a new 2011 Chevrolet Equinox, certified used 2008 Lincoln MKX, certified used 2010 Buick LaCrosse AWD, or any other new/certified used car I can find for under $30k with AWD for my 16th birthday. What are the pros/cons of each car, & new/certified used, etc. As much info as possible would be very helpful.