Me & the wife are also looking at concrete CYV also. The main reason is energy efficient, sound-proofing, and hurricane cost. It is definitely cheaper insurance wise.
As far as tornados. We presently live in tornado ally in East Central Alabama, having two tornado seasons a year, spring & fall. During each we can have days were we have 3+ a day and over 100+ per year. Matter of fact tomorrow we are suppose to have some. That being said, NOTHING is tornado proof, let me repeat that NOTHING. Tornados are the most destructive weather I have ever witnessed. I would take a hurricane anyday. I have witnessed entire sections of cities and homes gone, I don't mean rumble standing etc, just gone. Doesn't matter WHAT or HOW they were made, just bare ground left.
All you can do is brace with your maybe 10-15 minute warning time and hope the tornado drill you practiced is enough.
Army Guy
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Scouts Out!!!! 
NJ, PA, NC, AL, Germany, etc, etc and finally The Village of Bonita.
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