Nikon F5.

Seriously, although I am a Nikon shooter, buy the best camera you can reasonably afford. The 1V has a major performance upgrade over the other two in terms of motor drive and autofocus speed, so if the prices are reasonable, get one. I picked up my F5 (Nikon's cousin to the 1V) for around $400 US and it's worth every penny.

If the 1V is too expensive, then you have to decide between the build quality of the 1 or 1N and the faster speed of the 3. (I use my F100 - analog to the 3 - more than I use my F4 - analog to the 1 - but this will depend on your particular circumstances.)