Why not stick with what you know, and for the occasional larger prints do them in a large daylight tube?
Big processors are like fine horses. They need to be run regulary, and will drive you broke keeping them alive whether you run them to thier full capacity or not. Big processors eat chemistry if they are not run regualrly.
I have a CP-31, and once or twice a year some years I get a yen to break out the huge print tube and roller base when I want to print larger than 12" the CP-31 allows.