The SB2 is the wired version, and the SB3 is both wired and wireless. Forgot to add-Cal is one of my favourite cities, and was there a couple of months ago.
I spent a couple of years studying at Jamshedpur in the 1970s,and have been there many times after that, when I met aks07.
To listen to radio on receiver/ duet - do you need to keep the PC on?
don't worry about the range. I played music in 2nd floor while the pc was located in the first floor. I played wav files which are pretty big. It performed flawlessly. But you need to have a good wirelss router. I use Linksys 54G and it serves my purpose pretty well.