The ideas in the OP seem sound. I think people may enjoy TE a good bit more if other accomplishments besides "Highest NS at the end of the round" were recognized. It may even improve forum activity a bit if players were contacted in-game informing them of their award(s).
Besides the ones mentioned in the OP (most of which would probably be decided by polls), I think various awards relating directly to in-game stats would be good. As Tallah mentioned; Attacking, Defending, and Total casualties are all recorded in-game, and some recognition for these stats would certainly be in the spirit of TE. Another good idea (though it would have to be programmed into the game) would be to have a counter for how many wars a nation is involved in over the course of the round; together with counters for how much a nation has plundered or destroyed. These same counters could be applied to alliances (adding up the stats of all players combined). And another possibility for that suggestion would be to have a record of the average NS ratio between a nation and those it attacks (i.e., are most of a nations wars against larger or equal players, or does it more often pick on smaller folks). Though that may be overkill.
Also: I suggest a new sound-effect for nukes, to facilitate their acquisition and subsequent use.
http://www.youtube.com/watch?v=wcW_Ygs6hm0