TruePianos is my go to when it comes to finding a "real" sounding piano. It really has a nice reverb to it and makes me feel like im playing a classic piano. When im looking for something atmospheric or unique, check out Nexus and Omnisphere. However, Id like to point out that many people have already overused Nexus pianos. To get around this I suggest downloading extra preset packs or ensuring you layer your nexus pianos with other sources. Many people will instantly hear the overused Nexus presets and you wont sound original. Nailing pianos is a difficult task, good luck!