i bought my current vehicle in the dfw area almost 10 years ago. my experience was that both selection and price were better in texas than in oklahoma. i can't remember too many specifics from that long ago, but i don't think i paid any sales tax to texas... but i could be totally wrong. it was a used vehicle, but i'm not sure if there would be any difference. i definitely paid tax to register the vehicle in oklahoma. i do remember that the transaction went smoothly and there weren't any complications. the only dumb move on my part was that i had a trade-in and didn't bring the title with me. also, you'll want to call up your insurance agent and let them know that you have a new vehicle. you'll likely get coverage under your existing policy, but it's a good idea to give them a heads up just in case anything happens when transporting the vehicle back here.