Pestalence
actually the NCC-1701 enterprise in TMP and ST2 the wrath of kahn is a constitution refit. it is supposed to be the actual same spaceframe (and therefore ship ) as in TOS. the NCC-1701-A enterprise is the first "enterprise class" ship ....it was built new from the keel up, originally christened the Tihoe, it was rechristened the enterprise after kirk was demoted followint the whalesong incedent.
ps: the constitution refit (movie version) or enterprise class is my fav ship of all star trek ships. if u limit the choice to TNG it would be the prometheus class