I wouldn't even get a DSi...
I mean seriousely, the ONLY new feature of it, compared to a usual DS with a working Sakura firmware on its flashkart would be the camera, and that the browser is a little faster, but still no flash support. Then you can't play your GBA games anymore (and there are some really good ones!) And then... no MP3 support, no ogg support.. AAC format... (And who REALLY needs the voice and music editing stuff? oO*) I wonder what Nintendo was thinking...? Did they even have a look at what was possible on their old DS using a flashkart? And if they did, why didn't they just react to it?
Okay the CPU's and everything are said to be a little better than the ones of the normal DS, but if you look at the downloadable content they showed in their commercials and on some websites... from what I have seen up until now much of the DS's homebrew is BETTER than that... So if your cellphone does have a proper camera (and mine does) then just stay with your DS for now. ^^
I mean... okay perhaps they'll come up with some really good downloadable content, like a mp3 player, or even a videoplayer, but my DS does have it NOW and I do not want to miss my GBA games, and just for playing around with a camera I wouldn't spend so much money into nothing. No way!
I'd only buy a DSi if it's clear that M3i (if it comes out) WILL work on the EU version of the DSi, plus if someone would come up with a reliable GBA emulator...
Oh yeah almost forgot... I do have problems holding my DS for 2 hours or so, because of its shape, and they evne make it thinner? O_O From its shape the first ever DS was really great. The DSL with its sharp edges sucks sometimes, and I don't really want to imagine how the DSi feels. x)
But if someone really ordered one... feel free to write a little something about it...