I was about to vote other and reccomend Zack and Wiki, then noticed the poll's closed. D'oh!
As for buying a DS - I wouldn't.
Rumour has it that the next version of the DS (minus GBA compatibility) is just around the corner. That's half the reason I sold mine on Christmas eve for £123.
Even if the rumours of it being imminent prove false, you just know it will happen in due course....