Wiimote+Nunchuck ,Nintendo games.And 3rd parties support this year should be enough reason for you to buy Wii. :D
Check Wii game in 2009 which created by Benga ,i hope there're many games you may interested.:)
Btw,almost 3 months now that i looking for another Wii[US] in my country or Play Asia.But still found nothing.(Don't want to risk by bought used one ,because there're many moded Wii here.) :(