Guitar Hero III wii (Sound issue fixed :> )
SSBB
Medal of Honor Herooes 2 Wii

Maybe none. All the good Wii titles are massively delayed in Australia, and most of Microsoft's awesome first party line-up has been put back to the second half of the year. I may pick up Lost Odyssey though, if it makes it to this quarter.
As for PS3, I might purchase one towards the end of the year, but it has no compelling software at the present time to justify $AU700 (not to mention taking out BC, which i want).

My priorities go like this:

1. Super Smash Bros. Brawl
2. No More Heroes
3. Metroid Prime 3 (used)
4. Zack and Wiki (used)
5. RE4 (used)

The first two are for sure that I buy them, the others are possible.

PS3:
Assassin's Creed
Burnout Paradise
Devil May Cry 4

Wii:
Lego Star Wars: Complete Saga
Zack & Wiki
Ghost Squad
Medal of Honor: Heroes 2
Dragonball Z BT 3
Battalion Wars 2
No More Heroes
Bully: Scholarship Edition
Fire Emblem: Radiant Dawn

Well, ofcourse, I probably won't buy ALL of them before 31 march, but yeah.

I really want SSBB. I could also go for SMG, MP3, and Z&W. Possibly No More Heroes as well.