The high rise models are nice as we age as long as you don't expect kids or really short adults to use it. That being said the A. S. Champion 4 has a neat video where they flush all kinds of things including some very realistic looking poop that is actually a big pile of miso!
http://www.youtube.com/watch?v=gaWDH16SqVs
Whatever John you get you might want to go all out with one of these bidet seats that washes your butt and is heated for chilly mornings. Think about how much toilet paper you will save!
Heated seat and a wash your butt system!
http://gizmodo.com/5875527/the-great...-ive-ever-seen
Kohler Butt washer
http://gizmodo.com/236933/kohler-c3-...american-style