I agree that the MTII seems to be the only one in this class (inexpensive flash recorders) that meets all of your requirements.
But you should also take a look at the R09 and the Marantz PMD620. They both take AA batteries, but you can get some pretty good record times from both using rechargeable batteries. Two pairs and you have a lot of recording time!
What it really comes down to: think about how you are going to use it and how much you want to spend...Then spend a few hours comparing different makes and models, and make some sort of choice. In the end, most devices have their fans and detractors, so you will have to sort through a lot to determine what is best for you and reflects your priorities (specs/size/weight/recording medium/build/etc.)...The forums here are a great place to start, though...