Nintendo themselves said that they expect DSi to ship 1.2M-1.5M.
It has already sold off 300K of those (in VGChartz numbers time). So it will probably sell ~ 1M more (perhaps slightly lower)
PsP sold 600K in December last year. With the 2 weeks left of November, that would total ~ 700K (if it sold same in December as last year). I don't think we can expect it to sell more than 1M for the rest of the year.
So - I think this is the question.
Can DS lite sell over 350K this holiday, in Japan?
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS