If you like the GTA games, Bully (Scholarship Edition), on the Wii is pretty cool - Lego Star Wars is fun, but needs two people to really enjoy it. Guitar Hero III, if you don't already have it and can afford it, is at least equal to Wii sports in terms of replayability - probably better, since some of the sports games tend to be masterable, and you lose interest (Bowling and Baseball especially).
Alternately, pre-order The Force Unleashed, and hope like the rest of us that the supposed true lightsabre combat isn't going to be more or less what it was in Lego Star Wars.