Japanese toilet with the sprinklers -> bidet. The best pooping experiences have been in japan, never been so clean. Always searched for those waterjet toilets.
They have them at Amazon, there was an eye-opening thread at GAF about $700 toilet seats, although there is a version available for like $350.
As someone who's never used a bidet, I have to say it's really opened my mind to how clean I should be back there, and how much time I spend
trying to get clean when I should just be washing my ass.
It's common sense, really.