Last year, I got all 3 of them, Xbox 360 (April), Wii (Nov), and PS3 (Dec). Today, I have only the Wii and PS3.
Honestly, I haven't turned on the Wii for almost 2 months. Nintendo needs to come up with something more fun. I'm waiting for the Wii fit tho. On the PS3 side, I love it. Now, I'm thinking of getting a PSP Slim.