I have an Xbox 360, should I buy a ps3 or a Wii as a second console?

As an owner of all three systems, I honestly find myself playing games on my 360 more than either the Ps3 or Wii. I just simply prefer the interface, and controller of the 360, but if it is a matter of value you can't p the PS3 blu-ray, wi-fi, easy hdd upgrade.