Just got my DSi today and want to buy a new game to play. Which should it be?

Finishing Mario & Luigi: Partners in Time and then want a new game to play. I plan on buying all of these games at some point in the next five or so months and wanting a long game length isn't much of a problem. I'm also asking because at the moment, I like these games all equally.

out of the list i would say GTA but i would highly recommend the world ends with you.

If it's your first DS, you can't go wrong with Mario 64 and Zelda. Also consider Fire Emblem, Pokemon, and Advance Wars.

Really depends on what you want.  If you want something to play for 10 minutes in between daily activities, go with Rhythm Heaven.  If you want something more in depth, go for GTA.

GTA Chinatown Wars is the most solid DS game I've played.

Things not on the poll I would say Pokemon Platinum, Chrono Trigger, Final Fantasy 4, Zelda, or Fire Emblem. But if you only want things on the poll, I'd say GTA.

shadows_kill: I would've put "The World Ends With You" on the list, but I forgot the name.
Superchris129: This isn't my first DS, I bought one in 2004 and decided to upgrade. I've played all the one's you've listed.
CL60: Already have Pokemon, Wasn't sure if Chrono Trigger was good, Not a Final Fantasy fan, and have already played Zelda and Fire Emblem.

Thanks for your input everyone.

Go have a look at some threads here in the Nintendo DS board:

I'd say Chrono Trigger is one of the best RPGs I've ever played.