Dontcrack is having
a Black Friday sale on NomadFactory plugins through the end of the
week month. For those looking to take their BlueTubes Sonar plugins into their post-Sonar after-life, this could be of interest.
I would recommend going straight for the Integral Studio Pack. In addition to all the Blue Tubes plugs, it contains Magnetic (I and II), which can serve to not only replace but supplant ProChannel's tape Saturation, and a bunch of other plugs that may at least serve to ease the parting blow. :D
Also, Magma may be worth a look as a possible pro-channel replacement. The modules may not be of as high quality as those of ProChannel, but there are far more of them to choose from.