[Elecraft] wanted k2/ is the kx3 is better in what way ?

[E.P]

hi sorry about this i am new to elecraft but new to ham radio over 40years after nice e-mail from  Vicenç  from Spain he correct me  so i am after i am after k2 with high serial number 3k or over with all option [not need to have the 100w amp ] have to be built by one of the Elecraft builder recommendation please and in nice good condition in and out i can paypal thank you kind vy 73 elan g0uut
p.s is any one can tell me if the k2 have TCXO ?is the kx3 is better from the K2 ?in what way ? i may in the end order kx3 thank you elan g0uut