Korg makes a good, well built product. If you are mostly interested to play piano, look into the Korg D1. It has Korg's excellent RH3 action & weighted keys, but doesn't have all the fun stuff like 400 voices and beats. Nor does the D1 have built in speakers, but most built-in speakers are tinny anyway, so at least you avoid paying for those. Play it with headphones, add speakers when you can afford good ones.
I started out on a 61 key keyboard, a Yamaha. I liked playing so much that I soon wanted to upgrade to a weighted 88 keyboard for a truer piano-like experience. I went round & round with decision making, at first lured by the attractions of 500 voices & beats & modulations, But so many of those kinds of digital pianos fell short in the key action department, or I saw too many complaints of keys becoming clickety shortly after purchase. I settled on a Korg C1 console -- few bells & whistles, but excellent quality. The RH3 action feels great, not stiff near the fall board, the 30 tones are nice, & no clickety keys as of 7 weeks of ownership.
But if you want all those fun sounds/beats/other stuff, and a weighted 88 key keyboard for a decent price, also look at the Casio CDP S350. It offers a lot for the price. If you take to piano playing, it will be a long while before you'd grow out of it, like you would with a 61 key instrument.
I love my Korg C1, but there are still times I wish I had tubular bells or sitar sounds or other fun voices to play around with. And I think drum beats would be more fun to play along with than a plain old metronome.