Yamaha's keyboard/ digital piano (compare to Casio)?

Hi, I am looking for a digital piano too. Price is the first issue. 500, 700, 1000, are all, more or less price points. You can't go farther until you know your price point (if any). Casio has 2 new models model120--$500, and model320--$700, which are improvements over 110, 310.
Yamaha has p85--$700, an improvement over p70, but more money

To all of them I prefer the Yamaha p140, but it is 1000.So, I am leaning toward the Casio 320, because it hooks up with the computer via USB. I suggest 88 keys, with a piano action. All the ones I mentioned have that, but the p140 has the most piano-like action of all.

Another good brand is Kawai, but it isn't as readily available. The less expensive model is the M5 for 1100, and has a very good action too.

Not necessarily. The sample set and the sample rate will determine the better sound quality. In this case, however, I like the ZPI sounds on the Casio Privias. ... as for bells-and-whistles... the Arius YDP-160 has few. But it's a nice piano for the price in a proper cabinet with a proper bench.