The only reason I upgraded to the dsi for my son was as he broke his ds.
Ok so it's got some extra features on it but it's not like he uses them all the time.
---------- Post added at 18:13 ---------- Previous post was at 18:12 ----------
What I'm trying to say, badly
, is that I don't think it's worth the extras
---------- Post added at 18:21 ---------- Previous post was at 18:13 ----------
Another thought, if you're low on funds don't forget the ds can play game boy advance games while the dsi can't.
You will likely to pick up cheaper game boy advance games on ebay amd the like.