Originally Posted by Nick Beecham
The next step is to transfer the files to the Blackberry and then I am presented with a choice:
Copy with no conversion; or
Convert for optimal playback (recommended).
I'd also recommend just using Mass Storage Mode. However, if you want to proceed down this path:
Consider that there's no way that you can "convert" a file to add quality, regardless of what the file is. It only gets degraded as you convert (granted, not all conversion process are lossy) and compress further.
Personally, I've found that using a better encoder (like lame) makes a bigger difference and is more efficient than simply increasing the sampling rate.