We've had an LG, a Bosch and now a Miele. Miele is definitely the best, which you would hope/expect with the price tag. LG was very good, and it was one of the cheaper ones at the time we bought it about 6 years ago. Bosch was really disappointing - didn't clean well and really didn't dry well either.

Must haves - adjustable heights on your shelves. My "good" dinner plates are quite big and so the ability to move things around a bit is brilliant. Fold down "flaps" allow for say bowls or cups underneath and then cooking utensils on the top of the flap. A cutlery drawer, as opposed to baskets, is also really good for getting things clean and much drier.