Raiders is perfct. ToD was awesome in its own offbeat and mean way. LC is very very likable, but in the end (especially if you've watched the movies a gazillion times) is just too dependent on cute humor, which makes Indy feel less hard boiled. Ironically, LC feels like Roger Moore to the Connery of Raiders (pun intended). ToD is amazing in the way they took this massive pop cultural phenomenon and did something way out of this world with it, akin to giving the middle finger to mainstreamness. Brilliant in its own way.
National Treasure is nothing but a revolting Indy knockoff with an eye on milking the Da Vinci Code hype. The only Indy knockoff worth its salt insofar is the The Mummy.