Well if you know Ninty enough, you should know that they ALWAYS give you a WOW

.
But every first products is CONSIDERED as market surveyor (Ask Marketing or packaging people).
which mean it may have a lots of problems and spaces for improvement.BUT if you interested, go for it.
Expansive for First Experience while later, cheaper for stability.
For example the NDS fat, everyone WOW for it at first too.
And the ugly beast soon evolve to the DSlite we know. A much SLIM and Better Version of DS.
By the ways,
3DS sure is WoW (with 3rd party game producer as backup).
Some insider shown that, based on the Specifications of 3DS.
the Price will be ABOVE 200 bucks!
(NDSi release price is 175 bucks... and The NA ninty guy said its production price of 3DS is HIGHER than NDSi.)
and IWATA said " Piracy will be SURE not a problem then... "
this supported by the increase of Game cartridge saiz (2GB) (current largest:512mb.. i think so..)
Plus the FREE* internet content of the 3DS.
Hence, if you a Piracy's Fan, Dont Ever Think about the 3DS first.
*My Recommendation:*
if you want to play alone and tends to piracy game and guitar heroes.....
NDSlite will be you first choice..
If you support Originality

and a more multi function...
NDSi will be your choice
play M4A. Music... having fun with girl (DSi camera.. dont know why SHE love it...)
Statistically, (if you play JAP games too)
1 week will have about 4-6 games released (Dont forget the blood sucker... DSiware... alots of my $$ goes there)
Hence, even thought you it have only 1 year of lifetime DSl or DSi, there is alotz of game.
So far, based on review, only 1500 out of 5000(and ongoing) Game (US + jap) is prefer by gamers.
ADVICE:
ITS ALL UP TO YOU!!