Majin-Tenshinhan on 10 May 2009
I hear Excitebots is loads and loads of fun.
Personally, I'd recommend trying out Punch-Out!! and The Conduit once they get released (Punch-Out!! = May 18th, The Conduit = June 23rd).
MadWorld is pretty fun too, check out some videos and if you think it looks interesting you should probably pick it up.
