Another alternative is the K&K Bass Max, which mounts similarly to the Rev Solo, so you may have a bit of sanding to do on the bridge wing. This also has the advantage of being about the cheapest decent PU on the market. Mine sounds pretty good, but I plan on trying the Solo soon.
Also bear in mind that the PU alone may not be enough. Most players use a separate premp as well, due largely to impedence matching problems between the PU and standard bass amps. Some PU's are OK without them, some require one, but I think it's fair to say that almost all at least benefit from a separate preamp.
My Bass Max sounds MUCH better with one, and I thought the Realist sounded better with one as well, even though they advertise that no pre is needed. The Rev Solo is advertised the same as well.