I worked on appliances for a few years in Des Moines, including testing scratch-and-dent units before they went to the sale floor. Bosch DW were the best I ever worked on, and we trained on and serviced most (non-Sears) brands. There aren't a whole lot of serious problems a dishwasher can have if it's installed correctly (source of most problems with all appliances in general) and cleaned/maintained. Unlike certain washers, dryers and fridges with long histories of the same problems in some models, I'm not aware of any serious DW recurring problems. Regardless of the model, it should be at least 7-8 years before you have any sort of problems, anything before that can probably be attributed to the problems mentioned above.
Bosch might be out of your price range (at least it would be in DSM), some of GE's models are good and would be in your range, Amana/Maytag/Whirlpool are generally a step below those. My suggestion, find a place that sells scratch and dent Bosch, they should have already tested it before it went to the floor, make sure the problems are only cosmetic, if it's an 'as is' model, and you don't see a fairly obvious scratch or dent, be wary. As a bonus, at a later time you can replace the scratched panel in whichever color you want and do it yourself if you're handy at all and have a star-headed screwdriver set. Also, with any dishwasher, new or used, give the inner tub and inside door panel a good inspection for cracks or dents. Bosch uses a stainless steel tub which reduces these problems and noise, they also have an enclosed base, so if you do spring a leak it's not going to go on your floor. The big downside with Bosch (price not-withstanding) is that aside from a door seal or spray arm, it's really hard to work on-not probably something most people could (or should) fix themselves. These are all opinions based on personal hands-on experience, not sure how they stack up with the 'Consumer Reports'.