I already have a clipped d2pro I took off of my old drive, so I'm probably just going to stick with that, even though the flatmii would be appealing if I had the money for an external drive as well, as I'm chronically out of space.
After looking around a bit, I'm thinking about just ordering a drive from modchipcentral for 80$ since nintendo is going to charge me 75 anyways...
EDIT: I just went ahead with modchipcentral. A little more with the shipping, but at least this way I don't have to worry over my d2pro being useless.