Thank you both for your reply! I really do favor the Caroma for the larger trapway but, if am unable to get one in the tri-state area for less than $600 then I might have to settle for the Kohler Highline, which really seemed like the best second option for me.
I wish I had a pressure tank to inspect how it really works and how, or if, I could repair it. I did find a couple of video repairs online and even the repair of the pressure assist valve did not seem difficult. I would just have trouble shooting any malfunction because I am unfamiliar with it. If I do have to go with the Kohler, I also would not look forward to family members having to do the 'slice and dice'; but at least it would flush.
I would love to know of anyone out there might have even ordered a Caroma online. I really do not trust shipping on such a large breakable item.