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Pianoteq is a marvel of modern programming that gets better with every iteration and is exceptionally playable and customizable. Garritan CFX is glorious sounding right out the box (and actually, I think, quite different in timbre to VSL's offering I'm happy to have both) VI Labs Modern U is fantastic for its realism and playability. That said, I agree with Frédéric that the VSL pianos are as good as it gets (I have all of them and was excited to see they took delivery of another upright this week which hopefully means they'll be sampling it in their small stage!).
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You might find it helpful, OP, to duck over to the VI: Control forum and check out the "Ultimate piano comparison" thread in the sample talk subforum.
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