Excellent answers from Walweroom ,Wsjulz, Epwirjuo.
weighted keyboard and full size keys is your main thing to look for. And for this a new is around $800 -$1000.
Yamaha is also my choice. ( 88 Motif, $3700 ). for you stick with only weighted keyboard and full size keys.For the balanting of the hands. and its way cheaper.
Make a good solid on this first keys and you will never get rid of it. When you get up to a Motif, you can always have your first keys in your bedroom as a second keys. My is a Roland and a 78 TS 12 Ensoniq which as my favorite sequencinger.
So that's the story. I been a keyboard manager at Guitar Center for 4 years. that is what I will tell as your salesman
Been a keyboardist for 35 years
Have a uncle who is a classical pianist
Have a family member who won the grammy as a writer
Had a #1 R&B group, Pyramyd, Here in Arizona,
for four straight tears in a row.
Which open up show like Billy Ocean, Whispers
One way,Con Funk Shun, Klamax, David Sandborn, zapp
Stephanie Mills, Tower of Power, War, El Chicano and Malo
(Which is Carlos Santana brother Jorge Santana band)