Nokia most likely wouldn't repair your device, they'll replace your device with either N8 or E7.

Also with a device being dropped off from an unspecified height, anything could be damaged apart from just the screen. You might want to get a reliable electrician to inspect and repair damages (if they are repairable, that is). Even with the screen repaired, it has digitiser which may also need replacing if its damaged. It also depends on which side did it eventually land on, screen facing the ground? or backcover facing the ground?

For me, I would have long considered about getting a hard cover of somesort for N900 which I already have. I bought Otterbox communter case for my N900 which was an investment that has somewhat slowly paid itself in price. Apart from making N900 look ugly and even more bulky than what it originally was, I have accidentally dropped my N900 about 1 metre off the ground a few times with the Otterbox case and never had any serious issues with the device. Maybe you could consider buying that in the future too if your device is repaired or whatever.