I have to agree with Bill about Korg pianos. They leave a bit to be desired.

As Dreamer stated you're going to get a great quality piano sample on a Yamaha Motif ES or a Roland Fantom.

Also you may want to wait until Alesis cleans all the bugs out of the OS of their new Fusion synth comging out soon. It too comes in 88 weighted keys. This models is supposed to have the acclaimed "HOLY GRAIL" piano sample. It's supposed to be really good.

Kurzweil makes some nice ones but they will put a HUGE dent in your wallet.

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.