Hey guys, I'm looking for a really high quality, legit grand and upright piano instrument to use with Sonar. So far I've experimented with 4Front TruePianos, Pianoteq, Toontrack and Pianissimo and they were all small and uninspiring. 
 
I remember back in the day I use to LOVE Reason pianos, but I don't want to be using Reason just for that purpose.
 
Anyone have any suggestion? what's your favorite piano plug-in? 
 
Thanks!

If you have kontakt there's a great new product called *the definitive piano collection* which goes for $199 by native instruments.  Its four different pianos, all of which sound great.  Its pretty hungry in resources I've noticed, at least a couple of the instruments are.  Its a more versatile (and cheaper) alternative than buying those single instrument versions.

Actually, only three pianos in the collection.  There are four you can get a  la carte though.

I have been very happy with Addictive Keys. Affordable and very easy to operate with lots of control. Not the best out there but for the bang for the buck, it's pretty hard to beat!

Impact Soundworks, the Pearl. It's for Kontakt.

Something for everyone: http://www.sampletekk.com/

EastWest Pianos Platinum are quite nice...

Pianoteq...

Ivory...

there are so many Pianos available it's ridiculous...
and what is best is purely subjective...

Don't forget Orange Tree Samples Evolution Rosewood Grand, a love emulation of the Yamaha C7.
Also, 8DIO has some nice pianos, I have the 1969 steinway D, which is also nice. I also use Pianoteq--the full version is more tweakable than the Player version, and the Pro version is fully editable, note by note. I have the full and I don't think it's "small" but it is a physical model rather than using recorded samples. Still quite realistic and customizable in many ways with a number of models, from Steinway, to Bluthner, to their hybrid K2, all of them very nice.
there are others, but I don't have them (yet).

If you enjoy the Steinway D sound check out 'The Hammersmith Pro'

Not yet released, but I have high hopes for Wavesfactory's Mercury Piano... ;) Other than that I'd say the NI Definitive Piano Collection is pretty darn good: https://www.native-instruments.com/en/products/komplete/keys/definitive-piano-collection/
 
If I wasn't waiting for the Wavesfactory piano then I'd probably grab this: http://8dio.com/instrument-category/piano/#instrument/1928-steinway/
 
I have a soft spot for playing a piano, well, piano. :)