Forget the combo players (Samsung BD-UP5000 or the LG) for now. I own the Samsung and it WILL NOT send MA at all and will only send True HD in 2.1 channel. There is a lot of conflicting info right now as to whether or not they will via a firmware update soon. Many are calling Samsung and are being told no, while one or two were told yes. They have it in print in a couple of reviews that it will happen, so who knows? Maybe we will find out more in a week during CES.
As for the stand alones, I would go with the Pannasonic 30 for BD and either the A35, the (preferably, if you can afford it) Xa2 or Onkyo HD805, which is the same player rebadged, so I understand. Again, if you can wait a week to see what's coming out and when from CES, then I would do it. If not, go for the above.
Hope this helps.