Overcast - Nice demos of the 3 grand pianos
Sunshine - You are indeed lucky that you are being entertained by so many people in the so many threads that you have created. Despite wanting to know more about electronic music, you have revealed your most basic desire and that is to (and I quote you) "more than anything else, is just to play the piano again".
Synth kybds nowadays are a vast improvement from their predessors and do come close to the real thing in terms of the piano sound and feel. When it comes to acoustic instruments, what a synth does is to EMULATE the real thing. Even if any synth or sampler can produce the best sound and feel, there is always the X element missing when COMPARED PARALLEL with the real thing. The key phrase is "they come close, but they are not the real thing".
Since you have loads of songs in your head, play them when you demo on the kybds that you are testing even though your skils may be rusty (It would be good too to have a pair of headphones on when doing that). If you like what you play and hear, then congrats to you that you have finally found the r!ght one to CARASS!
Good luck with your search!