I do miss my 02, but more for the simplicity of it, i think my 04 is the best truck i've ever had, and as of right now i don't ever plan on selling it.
the power of the 3rd gens is nice for sure.
my 08 once it lost some weight is a nice truck, but it's not as nice as my 04 to drive.
my old ears like the quieter sound of the HPCR cummins as well.
if you have teh room to keep it, might as well, keep it for the winter driving, or woods drivcing and keep the new for the road trips... just my thoughts.