Thanks. Yes, a tornado is a whole other phenomenon. I'm better off building a steel reinforced bunker or safe room for that!
I did some online research, and will probably go with a modified mobile home anchoring system including the strapping to anchors in the soil, and connect them to the frame of the house. Since I have all the walls and ceilings stripped down the to the studs, I will nail hurricane straps from the roof trusses to the frame, and any connecting areas down to the frame.
After having seen what hurricanes and tornados can do, I realize that my 600 sq. ft. stick house doesn't stand a chance with a direct hit. But... we do get some pretty bizarre near hurricane strength winds with our afternoon T-storms and such, and a little reinforcement won't hurt. Unfortunately, if one of the giant oaks comes down... all the straps and reinforcement in the world won't help!
Thanks again for your input.