Ps3: mgs4 and ffxiii
Wii: brawl or animal crossing
xbox360: gow2, maybe ninja gaiden 2

Wii : Brawl
Xbox 360 : Halo 3
PS3 : Blue Ray... or Socom

A)
Wii : Fire Emblem Radiant Dawn
PS3 : Shirokishi Monogatari
DS : Final Fantasy Tactics A2 (now more like DQ IX)
B)
XB360 : None (Tales of Vesperia is the closest, but not enough)
PSP : Jeanne d'Arc (or FF Tactics remake)

PS3= Uncharted, GT5, MGS 4, FF XIII
XBox 360 =????
Wii= ????

Wii: Mario Galaxy. I was tricked into thinking it would greatness.
360: Ninja Gaiden 2
PS3: High quality gameplay.

A) Games that caused me to purchase the consoles I currently own...

Wii: Wii Sports (Purchased at launch)
DS: Zelda Phantom Hourglass (Purchased last year)



B) Games that may cause me to purchase a console in future...

Xbox: GTA4, Banjo Kazooie 3, Fable 2
PS3: GTA4, Gran Turismo 5
PSP: None

360 - Lost Odyessey 2
PS3 - FF13
Wii - Mario Kart

360: LO
PS3: MGS4
Wii: SMG

Wii-Galaxy, Brawl, the controls, a lot of things.

360-I bought it out of impulse, but I'll go with Virtua Fighter 5 (I need mine with online!).

PS3-Final Fantasy 13, easily. 

360 : Bioshock, Alan Wake
PS3 : MGS4
Wii : hum ... maybe the next Zelda ?