Confused with keyboard purchase

Yamaha psr i400 from flipkart in 18k new

Yamaha psr i455 from olx 1.5 years old in nice condition also in warranty 15k (may reduce to 14k)

Also Yamaha psr i425 in 14500/- from market place. This one is quite old as she doesn't remember when she bought it

Which one is better for me? I just want to learn as a new hobby and do something other than my work