i am thinking of buying a kenwood double din. however i am having difficulty choosing the correct one. the 2 i hav in mind are the DDX-7029 and the DDX-8027. some friends hav said the second one is better since it has 5V preouts however i think the USB on the other one is better, i also dont no which one is the latest model out of the 2...can anyone give some advice pleasee..