Bentonville is definitely going off with the trail building and more importantly, it's sparked trail building all over the state. Some of the best trails are outsider of Bentonville nowadays. Slaughter Open in Bentonville gets plenty of hype but Hot Springs, Bella Vista and Mt Ida have great looking trails as well.
North Texas actually has plenty of MTB riders and XC style trail systems. I have a few buddies that are serious racers doing the 50 miles races all over teh region. One guy has been series champion at his age group more than once. When it's off season, the do a CX series where you race as hard and fast as possible for 45 minutes. You'd fit in great because they all wear spandex full time. My buddy insists it's cooler than baggies.
I have family in Houston, Killeen, Austin, Kerrville and several smaller farming areas like Yoakum, original home of Tandy Leather (I'm sure we all remember the leather stamp kits you could buy to design your own belt, wallet, etc...that's Yoakum). None of the areas have riding anything close to the quality we have out this way. Much rockier overall, heat and bugs are also things you'd deal with but worst of all, all teh BIG cities have horrendous traffic which aside from politics is the #1 reason I want out of CA.