Honestly, I can almost guarantee you that those "games you aren't interested in" you'll probably be interested in when you pick them up and play them. Previously, I hated Advance Wars, now I love it. Nintendogs, as weird of a game as it sounds, is very impressive to play and to this date is the game that takes the most advantage of the DS' hardware between the graphics, voice recognition, and touch control. Mario Kart DS is also a MUST HAVE game for any DS owner, New Super Mario Bros. is a nostalgic throw back to the old school days, Yoshi's Island DS is a more challenging rendition of a Mario game, and both of the Castlevania games on the DS are great (by the way, for those that didn't know, another new Castlevania was announced today). Metroid Prime: Hunters is also a great purchase, whether you like Metroid or not.
The DS is a great investment.
Well I don't get my paycheck for another few weeks (I work part-time at EB but the discount doesn't apply to systems). I was always thinking of getting Mario Kart and I was considering Metroid Prime Hunters. I know the other games are really good, but they just don't scream out to me. Oh new question. What the battery life? My friend said a DS is like an iPod in that you should only charge it when it dies or else its charge dies faster.