Many enjoy space enough for even the largest throne, but if you have a small patch of land for doing your duty, you might want a smaller toilet AND you probably don't want to sacrifice flushability or style. We combed back through a number of posts to find out what the top recommendations were for small toilets. Consider this a starter list. Additions are welcome.
...quite pleased. It is compact and flushed well. I would purchase it again if I were re-doing another bathroom. - Lonnstrom
It's great, nice and small and uses very little water. It has "power flush" and is really quiet. Sasha
Purist Hatbox Toilet from Kohler
...You know, it sort of looks like sitting on a small trash can. But it is small.- AT
Duravit Happy D
...projects 21.25" from the wall but I think it runs around $1000 and requires a plumber to install the tank inside the wall. - Yen Ha
The best small medium priced toilet I've heard of is the Toto ultimate (about 250$ 2 1/2 years ago). I polled residents in my building when I needed to change to a low flow model upon purchasing a unit I'd been renting and this model won. - Jonathan D.