My wife's Hyundai i20 is exactly the same, very stiff to get in to gear sometimes. To get it into 1st you have to go from neutral, into 2nd, then up to 1st. I've got a new box here to put in when this one finally gives up.
I would never, ever recommend a high mileage Hyundai. They are cheap shit right from the start and they certainly don't get any better with age.