I'd stay away from the Samsung_SCH-a950. My partner had it for a couple of weeks and returned it. Reception was awful. He's much happier with the Razr V3c.
I am considering the LG_VX8300, and the Samsung_SCH-a950. What I want most is the bluetooth capability and the speakerphone, although the mp3 is nice too. I currently have the Samsung-a670, which I have been using for over two years and I love it. If it had bluetooth and speakerphone I wouldn't be changing. I've heard many good things about both, but like the looks of the LG best. Please give any advice you can, listing both pro's and con's. Thanks