Hi I am new here and looking for your opions on my piano selection.

I've recently started searching of piano for my son（11 yr） After doing some research, I came up with my 2 choice

1. used Yamaha GP1 ，builf in 2001 ，dealer price is $6250+moving$299+tax, total is:$7190including tuning, and 5year warranty and life time full price trade in!

2. Private seller,barely Used Yamaha GB1k, 5' long, bought new at 2017, looks like brand new, $10500 includes tax. Without moving.


Which one do you all recommend? Thanks