...The Yamaha P-155 had a nice feel to it with some additional features but costs $1200 which is a little on the high side for what I can afford.
I think the number one feature to look for on a piano is the quality of the key action. If you think the P155 has better action than the P95, most people would agree with you.
About all those voices,... If you are seriously studying piano al ou need is the piano sound. But if you do want more, use MIDI and your computer. With the computer it's literally unlimited and easy to upgrade.
You should always be able to get at least a 10% discount at Guitar Center. That takes $1,200 down to $1080 which might still fit into a "just over $1K" budget. The trick at GC is to know the a salesman's job is to close the deal NOW and not let you walk out. So you go in there an play the P155 untill someone notices you and asks if you'd like to buy it. Then tell hinm the truth. "Nice piano but I need $200 more cash before I can buy". He will offer you a load, say "I don'tr do debt, I'll buy after saving more" Finally he will be forced to lower the price and then he goes and checks what the store paid for it, Finds there is 15% to work with
But if you go in and say "I want to buy the P155. Oh by the way can I have a discount?" It does not work because the salesman does not need to offer discount, as the sale is already closed.
But don't try this unless you really, can buy right then and there.
BTW if you like the sounds in the keyboard you have now, you can use the old keyboard are a tone generator via MIDI. It's easy if the keyboard has round MIDI jacks, you'd need a computer in the lop in it has only USB.