I have all three i would say:
1. PS3
2. Wii
3. Xbox
Although it is close between PS3 and Wii. I wouldnt get an xbox, there are plenty of great exclusives on the PS3 and tons coming, plus you get a bluray as well as a well built system. If you buy an Xbox there is something like a 40% chance you are going to have to replace it/repair it within a year.
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