Should I sell my Wii and PSP and buy a PS3?

I was thinkin bout gettin this game for my PSP where u can talk with people too and get a headset but then I thought about how I probably wont play it that much. And noticed how my Wii I dont play too often either. My brother has a 360 but is too stingy and I barely ever play it. And I have always thought of a ps3 but never truely wanted one. But now that i notice I barely play the games I have, maybe I should just sell them and just get a PS3. And I noticed how fun GTA 4 looks on PS3. It looks just as fun as on 360 and I dont want to have the same system as my brother. So what do you think?(and dont say get a 360. im not gettin a 360)