Intresting choice of games. First I would say, that you might only need one of the My Sims games. You should buy the second one, after you made sure, that you enjoyed the first one. I only played My Sims Kingdoms and I liked it.
For fair reviews of Wii games you should visit http://www.youtube.com/wiiviewr
Because of your selection of games, I belief, that you are intrested in family friendly games. I would recommend the following games:
The Lego Series (Lego Star Wars, Lego Indiana Jones 2, Lego Batman, Lego Indiana Jones [sorted, started with the best])
Great fun. Good cooperative game play. All are good, but like with MySims you should start with one and only buy more if you like them.)
Dokapon Kingdom
Good Party RPG for up to four players.
A boy and his blob
Cute Platformer. Only one Player. Some riddles are tough.
Boom Blox Bash Party
Throwing blox can be fun. Up to four players.
New Super Mario Brothers Wii
Plattformer goodness for up to four players.
Those are some who came in my mind. For more and maybe better recommendations you should post, what genres you like. (Like curl-6 already posted.)
