i agree with what you guys said: popeye would probably be choice number one, because it is a fun game with fabulous artwork.
as for dkII, although it would be cool to have just to complete the dk lineup, why not simply throw the add-on into a dk cab and switch between games, after all, the four original levels are also included in the game.
and then there's radar scope: not an all time classic, but it was there before donkey kong, so it deserves it's place amongst the nintendo games. i'd rate the gameplay as ok (not sucky, not brilliant), but the sounds are somewhat annoying, don't you think?