Which of these should I get?

[Common Sense 312]

I need some help deciding which of those I should get.

[7Deadly$ins]

Sonic, he's the most awesomest thing since breaded slive.

Espcially if you played and enjoyed the first Sonic Rush.

[Joe Kid]

You should get worms.

[Alucard]

SRA.

[Bone Thug]

You should also look in to Custom Robo Arena, and Digimon World: Dawn or Dusk, if you like those type of games.

[Termanian_Knight]

Sonic Rush Adventure.  :)

[GirlGamer]

Sonic rush adventure for sure!

[Skilliam]

Perhaps Mario Party DS?

[BradHummr]

Out of those games, I'd say go for Worms: Open Warfare 2. I honestly don't own any of them, but W:OW2 looks like a very promising title and is pretty high on my want list. ;) Especially with the four player wi-fi!