My top choice would be Julia's The Way To Cook...
that's what got me started on my cooking journey.
The others would be a mix of those I use regularly and ones I always want to cook more from but don't ever seem to have the time and/or audience for:
1. The Way To Cook ~ Julia
2. A little binder that I put together when I first left home at 18, it contains recipe cards written by my mom for family favorites. Over the years I have added a few of my own, plus some of my MIL's recipes that are staples here.
3. Betty Crocker (hardbound, circa 1983)
4. Joy of Cooking
5. The Around The World Cookbook