Disk vs. V-Brakes

What are the benifits of disk brakes over V-brakes, other then the
disks do not get as wet on the trails?

After the recent run-in with a dog on a downhill stretch of trail, I
am now in the process of replacing my rims and brakes on my mountain
bike, and am looking into the possibility of going disk.

My areas of concern with moving to disks, is the weight differences,
as well as the stopping range between none, and fully locked. My
current V-brakes are easly able to lock the tires up, even at a speeds
over 30mph.

From my understanding, V-brakes should be able to provide a larger
range of control over the disk (based on the diameter of the wheels,
over the diameter of the disks).
Is this incorrect?

Any insight into this?

Most of my riding is cross-country, single track if I can find it.

Mike
mlawrenc(at)gmail.com