Quoted:
In Texas, you want to be sure there is water. As far as the mineral rights are concerned, you will find that many parcels for sale in Texas already have been stripped of the mineral rights. West Texas land is cheap... for a reason. I'd look at Colorado, Arkansas, Wyoming, New Mexico, OK (yea, I said it) and maybe Utah.
JoJo is right. Water is an issue. I wouldn't buy land unless I had live water close and knew the water table wasn't so deep you couldn't put a decent well in.
In wetter regions, you can run one unit (cow and calf) for every 5 acres if you have decent soil and water.
You get out in some dryer western areas like deep south NM, and it's 50 acres per cow and calf.
I once got a tour of some properties around Harrison, AR. There were and probably still are some huge homes built more like concrete bomb shelters than a house sitting on 20 to 160 acre parcels.
All it takes is money.
Good Luck!