Im going PS2 as peek as the sheer number of titles made for it and the ability to play PS1. First edition PS3 with hardware backward compatibility and running yellow dog linux might win over that if they didnt nerf it.

That being said I recently got the Analog 3d with 4 controllers and theres something amazing about the speed at which u can boot and get into a 4 player game.

Later revisions fully fixed RRoD. Not to excuse the original issue, but if you get one of the S models (Trinity or early Corona boards), they're extremely reliable in my experience. I even saw a guy pour a whole can of Mountain Dew Voltage into his Halo Reach edition 360 while it was on (not on purpose, can tipped over) and after some time in front of a space heater it was good to go again. The 360 aged like wine and is very worth modding and playing still today.