I suppose being in Texas it never really gets too cold, so you'd never have to worry about the possibility of 100% coolant gelling up in the coolant passages, not that I have heard of that happening a lot..
It does get really hot there, and considering waters thermal conductivity is much higher than glycol, I am not sure I personally would run 100% coolant.
Basically we only add antifreeze because it increases the boil over temperature, and reduces the freezing point.
Wouldn't using 100% coolant effect the pressure in the system from time to time?
You may not have any issues at all, but if it were me in your case I'd go with a 60/40, or at most a 70/30 mix of antifreeze/distilled water.
NOTE: I am not saying you will have issues using 100% coolant, you will definitely have a lot less chance of corrosion, just wanted to bring up some points that I read about when I flushed my coolant system the last time, I went with 60/40 because it gets really cold here in the winter, and I like my heat to get warm faster, as I hate freezing..
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA