Instead of spending my bucks on new sound libraries each time I need some fresh sounding instrument for a particular tune, I spend some time tweaking the libraries I already have. I usually start by experimenting with layering two (or even more) patches and when the result gets close to what I have in mind it’s just a matter of some tweaks balancing the sounds and some processing. This concept applies for acoustic pianos, as well. You can spend some extra time layering sounds and tweaking processors but it can save you loads of money and you’ll find that in the end you don’t need to buy each new library that comes out to achieve good results. Furthermore, you can end up with that good sensation that you just recycled some stuff that was almost completely forgotten on your HD that cost you already some precious bucks, it happens to me many times. 