I was happy with Wii Sports and LoZ:TP for the first couple of months, do you really want to buy 10 games straight away?
I suppose I may as well list my games collection:
Battalion Wars 2
Endless Ocean
Excite Truck
Mario Kart Wii
Resident Evil 4:Wii
SSX Blur
Super Mario Galaxy
LoZ: Twilight Princess
Wii Play
Wii Sports
Zack & Wiki
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Key:
Core (not for beginners)
Crossover titles (great for everyone)
Bridging titles (good for getting none gamers into more core-like games)
Casual titles (casual through and through, usually lacking any depth of any kind, but are fun for a group of you)
Dependant titles (your view of the game depends on your approach to playing it, I view Endless Ocean as core)
I think that seperates things nicely, most gamers will be happy with any of the games except the purely casual ones, but if you plan on playing with friends and family a lot then a casual title isusually a great addition.
