When I googled Quercus alba for sale in east Texas, I found a sale at the Houston Arboretum's December Native Plant sale. Here is a link that might be useful: Houston Arboretum's December Native Plant sale

It's always tempting with any plant, not just trees, to buy the biggest one which often is a plant left over from last year. I've made that mistake more than once. The advice is to buy the current years offerings to avoid the root bound problem. Sometimes the older root bound plant will grow and thrive, especially if you loosen the roots, but not always. I bought a couple of large Mediterranean palms in 4 or 5 gal. pots for $10 each once and thought I got a bargain. Inside the pots it was just a mass of roots. I loosened them the best I could although the roots were very stiff, and nursed them along for two or three years and the darn things just sulked and never would grow. Oh well, we learn from our mistakes.

I don't think that hybrid gets fall color?

Choosing American White Oak vs European White Oak is a matter of personal preference. American White Oak has tighter knots but fewer tannins. Also, the available grades can vary, so that will affect what you want. Suggest you go to a local showroom and compare them. If your project is in the United States, consider that purchasing products that are made in North America rather than Europe will reduce the carbon footprint of your project. And, if you purchase American, you're supporting the U.S. labor force.