PS3
Sold my PS1 when I got PS2 cause of BC
Sold my PS2 when I got PS3 because of BC
Didn't get rid of my phat PS3 until I had all the games I wanted on the store or in HD collections so I never needed an older system again.
Same deal with Nintendo consoles though their games are less replayable for me and I normally just upgrade once there's Smash and/or Mario Kart
Oh but I have the Mona Lisa so I win