I have periodically thought of buffalo also---but they are kind of like my thinking about a tattoo when I was in the Army---I remained content to think about them.
One suggestion to keep in mind---buffalo need a far more sturdy fence than Longhorns. With that said, build the best fence you can afford---no matter what wonders around inside. Chasing escapees is never fun and depending on where they escape to---it can be very expensive! On the occasion that our cows got out as a kid, they never went to someone else's pasture---they always seemed to search out far more valuable venues to trample and pillage.
"A pessimist sees the difficulty in every opportunity, an optimist sees the opportunity in every difficulty” ---Sir Winston Churchill
"Political extremism involves two prime ingredients: an excessively simple diagnosis of the world's ills, and a conviction that there are identifiable villains back of it all." ---John W. Gardner
“You can’t go back and change the beginning, but you can start where you are and change the ending.” ---C. S. Lewis