We have just got a new printer, Epson Sure Color P9000, and so begins the onslaught of upgrades and costs for such, RIP O/S etc. It hasn't been as painful as I envisaged, managed to find a RIP that didn't cost every month, currently using the trial but for the money it's great, there is a Canon...
I've mainly used Quite Imposing for years now, occasionally use Impose on the fiery because our dongle is still working, in the last year or two have used Imposition Studio and Bookmaker by Devalipi Software, the trails have limited use! also there is an old version (3.8) if you can find it...