I have a friend who is fond of questioning our modern bathroom behaviour. He feels that if he got a piece of shit on his face, he wouldn't simply wipe it off with a piece of paper, but would instead use some soap and water. Following that line of thought, he is of the opinion that wiping your ass with toilet paper is a little bit outdated. I can't say that I disagree with that line of thinking. Enter the Toto Washlet.
It should be noted that washlet aside, Toto makes the best toilets out there. I can honestly say that there is quite a difference between the standard toilet and a one piece Toto Ultramax. First of all, it's more comfortable, secondly it uses a lot less water than an older toilet (1.6 gallons vs 3.5) and thirdly the flush is cleaner and quieter. Basically, it's just a much better toilet. Upgrading to a Toto will run you in the neighbourhood of $400 but if you really want the ultimate experience, you have to spend around $1500.
That's the price point at which you can get a Toto toilet paired up with one of their "washlets." The washlets will do just about everything your mum used to do when she changed your diaper without the awkwardness of having your bare ass exposed to the world. Attach one of the washlets to your Toto and you'll get warm water washing, air drying, seat heating and an air deodorizing. From what I can tell, the S400 is an S300 with automatic lid and flush mechanisms. I don't personally value those features and would not pay the large premium. Toto even sells a portable version, though I think that's going way too far and may in fact be completely neurotic. For the S300 you're looking at about a grand but can you really place a price on a sparkling piece of ass?