v2.3 software will introduce new possibilities for bass sounds, and may include some new factory bass rigs. I think that is why no one has any recommendations at this point. Also, there are more guitarists than bassists using the Kemper (Including me, but, I also play bass when I record)
The Amp Factory Ampeg profiles cover a lot of ground for me, too There are also good ones on the exchange(and searching/downloading from it will soon be more convenient, too). It may depend on what kind of a sound you want. In addition to the kind of bass amps that are currently popular, I'll sometimes use a Fender Bassman or even a Marshall plexi (with a cabinet swap, it starts to sound like their old bass amp) when I am doing retro or rootsy music.