If you can do without the 3.2 MP camera, go for 5700.
It has the new S60v3 FP1, a 16 Million color screen. Which is really topnotch!! The screen is crisp, and really worth it. Only downside is the 2Mp camera.
Also, if white color is ok with you, you could go for the normal N73, update it with firmware v4, and you would have all the features of N73ME. Go for ME only if you want the black color, and the the 2gb card which comes with it.