We seriously considered the Loveable Loo. [If you poke around Jenkins' site, you can download his Humanure book for free; I recommend it highly.]
In fact, we had pretty much decided that was the set-up for us, but the hang-up is that we couldn't use it until we were on our own property. Who knows when that will be? Until then, we would have to deal with black water (euphemism alert!) tanks and dumping stations.
Then, we stumbled across this little beauty.