"Did I miss something? This only has 16mb worth of wave forms without expansion? So, if you buy more expansion, you can get it up to what? 64 mb? While the Tyros has 96 mb built right in? Did I miss something, or is this Korg's best? What about the beloved PA1Xpro? how much sample space does it have?"

16MB is the RAM for Sampler not the factory sample ROM size. They didn't list the sample ROM size on their site, I'll have to check my manual or may be someone else can post.

The 96MB in Tyros is the sample ROM, I am sure PA1X has similar ROM size.