Obviously depends on what the launch titles are but if available, Paper Mario and Ocarina of Time 3D.

i will be definitely getting one in june, but most of those already announced games aren't launch titles(some of DS launch titles were released 2-3 years after launch of that handheld). it all depends on launch titles but if Ubisoft games will be made by Gameloft there's no way i will be getting any of them. 

I will pick my 3DS on day one, it will be full black, i will be able to pick one or two game top, so i will go with the best 2 games, based on reviews but the ones i looking for are...

-Mario Kart DS

-Dead or Alive 3D

-Star Fox 3D

-ZELDA ocarina of time

-Metal gear

-Layton 

The best 2 of this list will be the ones i will pick it up , sure i dont know what games will be there on day one , but those are the ones i most want so far...

Wow i had forgot about RE, still my girlfriend can get this one ...

I'll buy one,but, probably not right away. 

Metal Gear Solid, Street Fighter 4, and Resident Evil are the games I want right now.

i will have to wait and see. but i do want one.

I will definitly buy a 3DS, but there has to be at least one of these games available at launch so that I'll buy it on day one:

Zelda: OoT 3DS

MGS3: Snake Eater 3DS

Star Fox 64 3DS

(I know... only remakes right now^^)

Hells yes. Ocorina of Time on the go sounds WAAAAAAAYYYY TO FUN. Metal Gear, Resident Evil, Dead or Alive, at what the hell I can't name them all there's too many.

man I haven't such such a strong line-up for a console(even if some are remakes)

I will probably get the persona title and the kingdom hearts title 

I'll be getting it but not day one but of course it will depend on the pricing (insufficient funds).

Games:

Persona, KH 3ds, RE, MGS, DoA, and more.