Kingdom Hearts is a decent series (that needs a lotta improvements) that has great production value. I can't wait for KH III on PS3 and if I ever get a Lite, I'll look into KH 358/ 2 Days.
Unfortunately a Wii version would have potential to disappoint, since KH is kinda a button basher... and motion controls would get tiring.... it's suited to the other consoles but fingers crossed a spinoff arrives on Wii.