Since no one has mentioned the Aix yet, I will put in my two cents worth. The Aix is wonderful to listen to and is a great practice sample set as well. You feel like you are at the console with headphones on. It can fit into 8 gigs easily at 16-bit and the quality of the sound does not change dramatically between 24 and 16.
The down side is that is does not have a full swell or a 32' Contrebombarde, but it is still a joy to play. (And it has an enclosed Positif!)
Randall Mullin