Slingbox or Slingbox HD

I have a five year old slingbox solo which works rather well. I've managed to hook it up to a direct tv box,.a ps3 (for Sunday ticket), and an xbox360 (controlling Windows media center). I would hope that the newer models are better at compression so that streaming is smoother (perhaps a separate setting for mobile) but that might not be a priority for them. I would recommend a model with hdmi but that isn't necessary at the moment but there may come a day when composite and component are not included on devices.