I've been using Bibble Pro for a while as a well. Been quite happy with it. Fast, good results. While it is a Raw converter, it also supports JPEG, but I've never tried it.
I've never tried LR, so I cannot comment on it. Bibble works for me.
Been alot of hype on B5 coming (end of year).
This thread on the Bibble forums has a lot of people salivating on the ability to clean up photos. Again, I don't know how it compares to LR.