Man, that DS-Xtreme (Slot 1 solution) sounds pretty dope, if that review is any indication...
It doesn't play Pokemon Diamond though with this firmware version, so it fails for that... That game is too great
But uh... $124.95 US... That's roughly around (if not cheaper) the price that people here paid for an SC Lite, Super Key, and their 1 GB microSD...
I know I paid like $165 CDN for all that jazz put together... Granted, I did get the 1 GB Ultra II which wasn't totally necessary...
512 MB of space, you can live with that... Just switch out your games more often.
It might be worth the purchase over the SC/SKey/microSD combo anyway just for all the battery you save, this being a Slot 1 solution =P