1. done with tubes for life? either way that’s quite a commitment to SS.
2. you want or need that much power?
3. you want stereo with short interconnects and longer speaker wires OR mono with longer interconnects and shorter speaker wires?
4. any placement considerations?
5. normally, same power, it is easier to move smaller mono-blocks, however you are going from 450wpc stereo to 600wpc monos, the stereo weighs around 115, the monos weigh 97lbs, what’s another 18 lbs among friends with hand trucks and hernia prevention belts.