I have a feeling you would recommend World of Warcraft. *eyes signature*
I highly recommed you the "Tales of..." series, "Tales of Symphonia" (GC) is very fun and it has a good storyline, as well as replay value.
your going to have towait for..last story or xenoblade
Wii Games: Mario Glaxay 1&2, Smash Bros Brawl, Mario Kart wii, wii sports, wii play, Wii Party, Force Unleashed 1, Godzilla Unleashed, indiana jones:SoK Wii, Metriod:Trilogy, TMNT:Smash-Up, CoD:Reflex&black ops,NSMBwii, Link's zapper training,goldeneye,tomb raider anniversary,metroid otherM.
Although you probably want a Wii RPG, Paper Mario (N64) was pretty good if you haven't played it all ready. I don't know that many RPGs that are available for the system.