They are both TMP ships, so that works.
Im not sure which ship i'd like to see retextured myself its a hard one, lots of lovely TMP ships to choose from.
How about a Enterprise 3 retexture of your Enterprise in your connie pack? Just a few burn marks here and there would be cool.
Anyway as for the Miranda or Oberth... id have to say Oberth definately, its a great little ship that I always love to use, and has a class of its own. Science!