I would think a basic dishwasher would be sufficient. Dej is right....the more options it has the more that can go wrong with it.

Also, keep in mind that some renters have the mentality that they don't need to take good care of the things in the house since it's not really "theirs". They figure if it breaks it's your dime that will be fixing it. I think if you screen your renters and get someone that's mature and reliable you won't have a problem.

Try Best Buy. You might even be able to get a warranty on it. You can "deal" with the employees at Best Buy....if you want something just bargain for it and they'll usually give it to you in order to make the sale.