I would love, love, love to have Ivory,,,,, I might even spend more time playing the piano..... but... cost is a concern.
I settled on the Steinburg piano collection from Cakewalk. It's a sampled collection of 10 pianos designed to work with the Cakewalk Sound Center. It sells for $20 last time I looked. You need to run it with Cakewalk Sound Center, which is a synth included with MC7 which also sells for $20 last time I looked. $40 and you get a top notch DAW in the deal.
Not quite as good as the Ivory collection but for a guitar player who occasionally plays a piano part..... it works. Any time you hear ME playing a piano track in my songs, it is the Steinburg Concert Grand #1.
I used it at 3:23 to the end in this song
Fools Errand It's fairly easy to hear it since the music is essentially stopped and the piano part is soloed briefly.