DueAccident wrote:1000 is where it's at.
1,000 is not possible in a Default game, though you can probably get pretty close. A score of 1,000 would mean (1) leaving less than 50,000 people alive in all enemy territories, (2) losing no one, and (3) being the only person to score at all. There aren't enough nukes in a normal game (i.e. 25-50 cities per continent) to kill everyone, even if you buy units and play bigworld. It is possible to lose no civvies, though incredibly hard, but that, at least, is within the realm of posibility. To be the only person to get any kills, however, strains credibility.
Honestly, I would think that 750 or 800 would be about the upper bound, and even the, your opponents would have to suck.
xander