Decat is pretty easy to swap back to normal cats, but you if you have the tools, or easy job for a garage.
This all depends on what age, mods, history etc etc.
Does it have to be within 80miles for a strict reason? seems a little precise.
I usually travel a lot further when looking at potential cars, and have purchased cars that require a 5 hour drive to collect in the past. If its the right car then its always worth the extra time as opposed to a local one that may not be the same condition.